Datetime calculator

Author: m | 2025-04-24

IPv4 CIDR Calculator. IPv6 Converter. IPv6 CIDR Calculator. Netmask Calculator. Datetime Converters. Unix Time Converter. Datetime Difference Calculator. Number Converters. Unix

Excel Tutorial: DateTime Calculation (calculate difference

Added 29 Multiple-Choice Quiz Questions (update 5/15/2024)## Unlock the Power of C#: Master C# Programming from Scratch to Advanced Projects### Transform Your Career with Comprehensive C# TrainingAre you ready to become a proficient C# programmer? Whether you're a complete beginner or looking to enhance your skills, this course will take you from basic concepts to advanced programming techniques, enabling you to build robust applications and tackle real-world projects confidently.### What You'll Learn:1. **Getting Started** - Set up your development environment with Microsoft Visual Studio 2019 Community.2. **Coding Fundamentals** - Write, build, and run your first C# program. Get hands-on with your first lines of code. - Understand essential syntax elements like the period. - Make your program interactive with sound. - Master string input and processing. - Perform arithmetic operations and string interpolation. - Format outputs as dollars and percents. - Simplify your code using the Static keyword. - Collect and process numeric input. - Handle exceptions to create robust programs. - Utilize method chaining for efficient coding. - Work with complex objects containing multiple data types.3. **Logical Operators and Control Structures** - Use comparison and logical operators to control program flow. - Master if/else statements with practical scenarios.4. **Loops** - Gain expertise in loops with real examples. Learn about unary operators, for loops, while loops, and debugging techniques.5. **Projects with Control Structures** - Apply your knowledge in comprehensive projects using while, for, and if statements.6. **Variable Handling** - Delve into variable handling, including copying by value and reference, and array operations.7. **Methods** - Understand and utilize methods to structure and optimize your code.8. **Advanced Projects** - Undertake a wage summary project integrating switch blocks, methods, and DateTime.9. **Sum and Average Calculator Project** - Build a sum and average calculator step by step.10. **BONUS: Calculator with IronPython** - Create a fully functional calculator using IronPython, merging C# skills with Python for versatility.### Please Read Carefully Before Enrolling:1. This course is designed for beginners in C#. While it starts with basics, it progresses to fairly complex topics in some videos.2. All code is built in real-time, piece by piece, without PowerPoint

c - DateTime calculator - Stack Overflow

Skip to main contentSkip to in-page navigation This browser is no longer supported. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. -->TimeZoneInfo.ConvertTimeBySystemTimeZoneId Method Reference Definition Converts a time to the time in another time zone based on a time zone identifier. Overloads ConvertTimeBySystemTimeZoneId(DateTime, String) Source:TimeZoneInfo.cs Source:TimeZoneInfo.cs Source:TimeZoneInfo.cs Converts a time to the time in another time zone based on the time zone's identifier. public: static DateTime ConvertTimeBySystemTimeZoneId(DateTime dateTime, System::String ^ destinationTimeZoneId); public static DateTime ConvertTimeBySystemTimeZoneId(DateTime dateTime, string destinationTimeZoneId); static member ConvertTimeBySystemTimeZoneId : DateTime * string -> DateTime Public Shared Function ConvertTimeBySystemTimeZoneId (dateTime As DateTime, destinationTimeZoneId As String) As DateTime Parameters dateTime DateTime The date and time to convert. destinationTimeZoneId String The identifier of the destination time zone. Returns The date and time in the destination time zone. Exceptions destinationTimeZoneId is null. The time zone identifier was found, but the registry data is corrupted. The process does not have the permissions required to read from the registry key that contains the time zone information. The destinationTimeZoneId identifier was not found on the local system. Remarks When performing the conversion, the ConvertTimeBySystemTimeZoneId method applies any adjustment rules in effect in the destinationTimeZoneId time zone.This overload is largely identical to calling the ConvertTime(DateTime, TimeZoneInfo) method, except that it allows you to specify the destination time zone by its identifier rather than by an object reference. This method is most useful when you must convert a time without retrieving the time zone object that corresponds to it and you do not need to know whether the converted time is standard or daylight saving time.The ConvertTimeBySystemTimeZoneId(DateTime, String) method determines the source time zone from the value of the dateTime parameter's Kind property, as the following table shows.Kind property valueSource time zoneMethod behaviorDateTimeKind.LocalLocalConverts the local time to the

Excel Tutorial: DateTime Calculation (calculate difference, age

Try let charVal = Convert.ToChar stringVal printfn $"{stringVal} as a char is {charVal}" with | :? FormatException -> printfn "The string is longer than one character." | :? ArgumentNullException -> printfn "The string is null." // A char to string conversion will always succeed. let stringVal = Convert.ToString charVal printfn $"The character as a string is {stringVal}"Public Sub ConvertStringChar(ByVal stringVal As String) Dim charVal As Char = "a"c ' A string must be one character long to convert to char. Try charVal = System.Convert.ToChar(stringVal) System.Console.WriteLine("{0} as a char is {1}", _ stringVal, charVal) Catch exception As System.FormatException System.Console.WriteLine( _ "The string is longer than one character.") Catch exception As System.ArgumentNullException System.Console.WriteLine("The string is null.") End Try ' A char to string conversion will always succeed. stringVal = System.Convert.ToString(charVal) System.Console.WriteLine("The character as a string is {0}", _ stringVal)End Sub Remarks This implementation is identical to Char.ToString. Applies to ToString(DateTime) Source:Convert.cs Source:Convert.cs Source:Convert.cs Converts the value of the specified DateTime to its equivalent string representation. public: static System::String ^ ToString(DateTime value); public static string ToString(DateTime value); static member ToString : DateTime -> string Public Shared Function ToString (value As DateTime) As String Parameters value DateTime The date and time value to convert. Returns The string representation of value. Examples The following example converts each element in an array of a DateTime value to a String value.DateTime[] dates = { new DateTime(2009, 7, 14), new DateTime(1, 1, 1, 18, 32, 0), new DateTime(2009, 2, 12, 7, 16, 0) };string result;foreach (DateTime dateValue in dates){ result = Convert.ToString(dateValue); Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", dateValue.GetType().Name, dateValue, result.GetType().Name, result);}// The example displays the following output:// Converted the DateTime value 7/14/2009 12:00:00 AM to a String value 7/14/2009 12:00:00 AM.// Converted the DateTime value 1/1/0001 06:32:00 PM to a String value 1/1/0001 06:32:00 PM.// Converted the DateTime value 2/12/2009 07:16:00 AM to a String value 2/12/2009 07:16:00 AM.let dates = [| DateTime(2009, 7, 14) DateTime(1, 1, 1, 18, 32, 0) DateTime(2009, 2, 12, 7, 16, 0) |]for dateValue in dates do let result = Convert.ToString dateValue printfn $"Converted the {dateValue.GetType().Name} value {dateValue} to the {result.GetType().Name} value {result}."// The example displays the following output:// Converted the DateTime value 7/14/2009 12:00:00 AM to a String value 7/14/2009 12:00:00 AM.// Converted the DateTime value 1/1/0001 06:32:00 PM to a String value 1/1/0001 06:32:00 PM.// Converted the DateTime value 2/12/2009 07:16:00 AM to a String value 2/12/2009 07:16:00 AM.Dim dates() As Date = { #07/14/2009#, #6:32PM#, #02/12/2009 7:16AM#}Dim result As StringFor Each dateValue As Date In dates result = Convert.ToString(dateValue) Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _ dateValue.GetType().Name, dateValue, _ result.GetType().Name, result)Next' The example displays the following output:' Converted the DateTime value. IPv4 CIDR Calculator. IPv6 Converter. IPv6 CIDR Calculator. Netmask Calculator. Datetime Converters. Unix Time Converter. Datetime Difference Calculator. Number Converters. Unix Using DateTime class. This approach uses the DateTime class to create DateTime objects for the birth date and current date. It then calculates the difference between the two dates using diff and extracts the number of years from the difference. Example: This example uses the DateTime class to calculate age in years in PHP. PHP

TimeSpan Calculation based on DateTime is a Performance Bottleneck

EXTERNAL TABLE [asb].FactExchangeRate( [ExchangeRateKey] [int] NOT NULL, [CurrencyKey] [int] NOT NULL, [DateKey] [datetime] NOT NULL, [AverageRate] [float] NOT NULL, [EndOfDayRate] [float] NOT NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/FactExchangeRate/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--FactInventoryCREATE EXTERNAL TABLE [asb].FactInventory ( [InventoryKey] [int] NOT NULL, [DateKey] [datetime] NOT NULL, [StoreKey] [int] NOT NULL, [ProductKey] [int] NOT NULL, [CurrencyKey] [int] NOT NULL, [OnHandQuantity] [int] NOT NULL, [OnOrderQuantity] [int] NOT NULL, [SafetyStockQuantity] [int] NULL, [UnitCost] [money] NOT NULL, [DaysInStock] [int] NULL, [MinDayInStock] [int] NULL, [MaxDayInStock] [int] NULL, [Aging] [int] NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/FactInventory/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--FactITMachineCREATE EXTERNAL TABLE [asb].FactITMachine ( [ITMachinekey] [int] NOT NULL, [MachineKey] [int] NOT NULL, [Datekey] [datetime] NOT NULL, [CostAmount] [money] NULL, [CostType] [nvarchar](200) NOT NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/FactITMachine/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--FactITSLACREATE EXTERNAL TABLE [asb].FactITSLA( [ITSLAkey] [int] NOT NULL, [DateKey] [datetime] NOT NULL, [StoreKey] [int] NOT NULL, [MachineKey] [int] NOT NULL, [OutageKey] [int] NOT NULL, [OutageStartTime] [datetime] NOT NULL, [OutageEndTime] [datetime] NOT NULL, [DownTime] [int] NOT NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/FactITSLA/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--FactOnlineSalesCREATE EXTERNAL TABLE [asb].FactOnlineSales( [OnlineSalesKey] [int] NOT NULL, [DateKey] [datetime] NOT NULL, [StoreKey] [int] NOT NULL, [ProductKey] [int] NOT NULL, [PromotionKey] [int] NOT NULL, [CurrencyKey] [int] NOT NULL, [CustomerKey] [int] NOT NULL, [SalesOrderNumber] [nvarchar](20) NOT NULL, [SalesOrderLineNumber] [int] NULL, [SalesQuantity] [int] NOT NULL, [SalesAmount] [money] NOT NULL, [ReturnQuantity] [int] NOT NULL, [ReturnAmount] [money] NULL, [DiscountQuantity] [int] NULL, [DiscountAmount] [money] NULL, [TotalCost] [money] NOT NULL, [UnitCost] [money] NULL, [UnitPrice] [money] NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/FactOnlineSales/', DATA_SOURCE

datetime-timer - countdown / calculate time between

Language compiler will then resolve your method call to a particular overload of the String.Format method.For more detailed documentation on using the String.Format method, see Get started with the String.Format method and Which method do I call?.Example: Formatting a single argumentThe following example uses the Format(String, Object) method to embed an individual's age in the middle of a string.using namespace System;void main(){ DateTime birthdate = DateTime(1993, 7, 28); array^ dates = gcnew array { DateTime(1993, 8, 16), DateTime(1994, 7, 28), DateTime(2000, 10, 16), DateTime(2003, 7, 27), DateTime(2007, 5, 27) }; for each (DateTime dateValue in dates) { TimeSpan interval = dateValue - birthdate; // Get the approximate number of years, without accounting for leap years. int years = ((int)interval.TotalDays) / 365; // See if adding the number of years exceeds dateValue. String^ output; if (birthdate.AddYears(years) DateTime birthdate = new DateTime(1993, 7, 28);DateTime[] dates = { new DateTime(1993, 8, 16), new DateTime(1994, 7, 28), new DateTime(2000, 10, 16), new DateTime(2003, 7, 27), new DateTime(2007, 5, 27) };foreach (DateTime dateValue in dates){ TimeSpan interval = dateValue - birthdate; // Get the approximate number of years, without accounting for leap years. int years = ((int) interval.TotalDays) / 365; // See if adding the number of years exceeds dateValue. string output; if (birthdate.AddYears(years) let birthdate = DateTime(1993, 7, 28)let dates = [ DateTime(1993, 8, 16) DateTime(1994, 7, 28) DateTime(2000, 10, 16) DateTime(2003, 7, 27) DateTime(2007, 5, 27) ]for dateValue in dates do let interval = dateValue - birthdate // Get the approximate number of years, without accounting for leap years. let years = (int interval.TotalDays) / 365 // See if adding the number of years exceeds dateValue. if birthdate.AddYears years printfn "%s"// The example displays the following output:// You are now 0 years old.// You are now 1 years old.// You are now 7 years old.// You are now 9 years old.// You are now 13 years old.Module Example Public Sub Main() Dim birthdate As Date = #7/28/1993# Dim dates() As Date = { #9/16/1993#, #7/28/1994#, #10/16/2000#, _ #7/27/2003#, #5/27/2007# } For Each dateValue As Date In dates Dim interval As TimeSpan = dateValue - birthdate ' Get the approximate number of years, without accounting for leap years. Dim years As Integer = CInt(interval.TotalDays) \ 365 ' See if adding the number of years exceeds dateValue. Dim output As String If birthdate.AddYears(years) See also Formatting Types in .NETComposite FormattingStandard Date and Time Format StringsCustom Date and Time Format StringsStandard Numeric Format StringsCustom Numeric Format StringsStandard TimeSpan Format StringsCustom TimeSpan Format StringsEnumeration Format Strings Applies to Format(IFormatProvider, String, ReadOnlySpan) Replaces the format items in a string with the string representations of corresponding objects in a specified span.A parameter supplies culture-specific formatting information. public: static System::String

Update for Silverlight DateTime calculations to handle new

Workbook in Excel//Create a workbook with 1 worksheetIWorkbook workbook = application.Workbooks.Create(1);//Access a worksheet from workbookIWorksheet worksheet = workbook.Worksheets[0];//A new workbook is created equivalent to creating a new workbook in Excel//Create a workbook with 1 worksheetIWorkbook workbook = application.Workbooks.Create(1);//Access a worksheet from workbookIWorksheet worksheet = workbook.Worksheets[0];'A new workbook is created equivalent to creating a new workbook in Excel'Create a workbook with 1 worksheetDim workbook As IWorkbook = application.Workbooks.Create(1)'Access a worksheet from workbookDim worksheet As IWorksheet = workbook.Worksheets(0)C# [Cross-platform]C# [Windows-specific]VB.NET [Windows-specific] //Adding text dataworksheet.Range["A1"].Text = "Month";worksheet.Range["B1"].Text = "Sales";worksheet.Range["A6"].Text = "Total";//Adding DateTime dataworksheet.Range["A2"].DateTime = new DateTime(2015, 1, 10);worksheet.Range["A3"].DateTime = new DateTime(2015, 2, 10);worksheet.Range["A4"].DateTime = new DateTime(2015, 3, 10);//Applying number format for date value cells A2 to A4worksheet.Range["A2:A4"].NumberFormat = "mmmm, yyyy";//Auto-size the first column to fit the contentworksheet.AutofitColumn(1);//Adding numeric dataworksheet.Range["B2"].Number = 68878;worksheet.Range["B3"].Number = 71550;worksheet.Range["B4"].Number = 72808;//Adding formulaworksheet.Range["B6"].Formula = "SUM(B2:B4)";//Adding text dataworksheet.Range["A1"].Text = "Month";worksheet.Range["B1"].Text = "Sales";worksheet.Range["A6"].Text = "Total";//Adding DateTime dataworksheet.Range["A2"].DateTime = new DateTime(2015, 1, 10);worksheet.Range["A3"].DateTime = new DateTime(2015, 2, 10);worksheet.Range["A4"].DateTime = new DateTime(2015, 3, 10);//Applying number format for date value cells A2 to A4worksheet.Range["A2:A4"].NumberFormat = "mmmm, yyyy";//Auto-size the first column to fit the contentworksheet.AutofitColumn(1);//Adding numeric dataworksheet.Range["B2"].Number = 68878;worksheet.Range["B3"].Number = 71550;worksheet.Range["B4"].Number = 72808;//Adding formulaworksheet.Range["B6"].Formula = "SUM(B2:B4)";'Adding text dataworksheet.Range("A1").Text = "Month"worksheet.Range("B1").Text = "Sales"worksheet.Range("A6").Text = "Total"'Adding DateTime dataworksheet.Range("A2").DateTime = new DateTime(2015, 1, 10)worksheet.Range("A3").DateTime = new DateTime(2015, 2, 10)worksheet.Range("A4").DateTime = new DateTime(2015, 3, 10)'Applying number format for date value cells A2 to A4worksheet.Range("A2:A4").NumberFormat = "mmmm, yyyy"'Auto-size the first column to fit the contentworksheet.AutofitColumn(1)'Adding numeric dataworksheet.Range("B2").Number = 68878worksheet.Range("B3").Number = 71550worksheet.Range("B4").Number = 72808'Adding formulaworksheet.Range("B6").Formula = "SUM(B2:B4)"The following code snippet shows how to add an image into the worksheet.C# [Cross-platform]C# [Windows-specific]VB.NET [Windows-specific] //Inserting imageFileStream imageStream = new FileStream("image.jpg", FileMode.Open, FileAccess.Read);worksheet.Pictures.AddPicture(10, 2, imageStream);//Inserting imageworksheet.Pictures.AddPicture(10, 2, "image.jpg");'Inserting imageworksheet.Pictures.AddPicture(10, 2, "image.jpg")Finally, save the document in file system and close/dispose the instance of IWorkbook and ExcelEngine.C# [Cross-platform]C# [Windows-specific]VB.NET [Windows-specific] //Save the workbook as streamFileStream stream = new FileStream("Sample.xlsx", FileMode.Create, FileAccess.ReadWrite);workbook.SaveAs(stream);//Disposing the streamstream.Dispose();//Closing the workbookworkbook.Close();//Dispose the Excel engineexcelEngine.Dispose();//Saving the workbook to disk in XLSX formatworkbook.SaveAs("Sample.xlsx");//Closing the workbookworkbook.Close();//Dispose the Excel engineexcelEngine.Dispose();'Saving the workbook to disk in XLSX formatworkbook.SaveAs("Sample.xlsx")'Closing the workbookworkbook.Close()'Dispose the Excel engineexcelEngine.Dispose()The complete code to create a simple Excel document is given below.C# [Cross-platform]C# [Windows-specific]VB.NET [Windows-specific] using

Calculate difference between two datetimes in MySQL

[ProductSubcategoryLabel] [nvarchar](100) NULL, [ProductSubcategoryName] [nvarchar](50) NOT NULL, [ProductSubcategoryDescription] [nvarchar](100) NULL, [ProductCategoryKey] [int] NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/DimProductSubcategory/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--DimPromotionCREATE EXTERNAL TABLE [asb].DimPromotion ( [PromotionKey] [int] NOT NULL, [PromotionLabel] [nvarchar](100) NULL, [PromotionName] [nvarchar](100) NULL, [PromotionDescription] [nvarchar](255) NULL, [DiscountPercent] [float] NULL, [PromotionType] [nvarchar](50) NULL, [PromotionCategory] [nvarchar](50) NULL, [StartDate] [datetime] NOT NULL, [EndDate] [datetime] NULL, [MinQuantity] [int] NULL, [MaxQuantity] [int] NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/DimPromotion/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--DimSalesTerritoryCREATE EXTERNAL TABLE [asb].DimSalesTerritory ( [SalesTerritoryKey] [int] NOT NULL, [GeographyKey] [int] NOT NULL, [SalesTerritoryLabel] [nvarchar](100) NULL, [SalesTerritoryName] [nvarchar](50) NOT NULL, [SalesTerritoryRegion] [nvarchar](50) NOT NULL, [SalesTerritoryCountry] [nvarchar](50) NOT NULL, [SalesTerritoryGroup] [nvarchar](50) NULL, [SalesTerritoryLevel] [nvarchar](10) NULL, [SalesTerritoryManager] [int] NULL, [StartDate] [datetime] NULL, [EndDate] [datetime] NULL, [Status] [nvarchar](50) NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/DimSalesTerritory/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--DimScenarioCREATE EXTERNAL TABLE [asb].DimScenario ( [ScenarioKey] [int] NOT NULL, [ScenarioLabel] [nvarchar](100) NOT NULL, [ScenarioName] [nvarchar](20) NULL, [ScenarioDescription] [nvarchar](50) NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/DimScenario/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--DimStoreCREATE EXTERNAL TABLE [asb].DimStore( [StoreKey] [int] NOT NULL, [GeographyKey] [int] NOT NULL, [StoreManager] [int] NULL, [StoreType] [nvarchar](15) NULL, [StoreName] [nvarchar](100) NOT NULL, [StoreDescription] [nvarchar](300) NOT NULL, [Status] [nvarchar](20) NOT NULL, [OpenDate] [datetime] NOT NULL, [CloseDate] [datetime] NULL, [EntityKey] [int] NULL, [ZipCode] [nvarchar](20) NULL, [ZipCodeExtension] [nvarchar](10) NULL, [StorePhone] [nvarchar](15) NULL, [StoreFax] [nvarchar](14) NULL, [AddressLine1] [nvarchar](100) NULL, [AddressLine2] [nvarchar](100) NULL, [CloseReason] [nvarchar](20) NULL, [EmployeeCount] [int] NULL, [SellingAreaSize] [float] NULL, [LastRemodelDate] [datetime] NULL, [GeoLocation] NVARCHAR(50) NULL, [Geometry] NVARCHAR(50) NULL, [ETLLoadID] [int] NULL, [LoadDate] [datetime] NULL, [UpdateDate] [datetime] NULL)WITH( LOCATION='/DimStore/', DATA_SOURCE = AzureStorage_west_public, FILE_FORMAT = TextFileFormat, REJECT_TYPE = VALUE, REJECT_VALUE = 0);--FactExchangeRateCREATE. IPv4 CIDR Calculator. IPv6 Converter. IPv6 CIDR Calculator. Netmask Calculator. Datetime Converters. Unix Time Converter. Datetime Difference Calculator. Number Converters. Unix Using DateTime class. This approach uses the DateTime class to create DateTime objects for the birth date and current date. It then calculates the difference between the two dates using diff and extracts the number of years from the difference. Example: This example uses the DateTime class to calculate age in years in PHP. PHP

datetime - exclude weekends in javascript date calculation

2 dates.var difference = date2.Subtract(date1);Console.WriteLine("DAYS DIFFERENCE: {0}", difference.TotalDays);DAYS DIFFERENCE: 1Month property. We access the Month property—this returns an integer from 1 to 12 that indicates the month. The value 3 here indicates the month of March.DateTime.Monthusing System;// Print the month for this date string.var date = DateTime.Parse("3/13/2020");Console.WriteLine("MONTH: {0}", date.Month);MONTH: 3DaysInMonth. Many static methods are also available on the DateTime class. With DaysInMonth we look up the number of days in a month based on the year.using System;int days = DateTime.DaysInMonth(2014, 9); // September.Console.WriteLine(days);days = DateTime.DaysInMonth(2014, 2); // February.Console.WriteLine(days);3028Error, null. A DateTime cannot be assigned to null. It is a struct, and like an int cannot be null. To fix this program, try using the special value DateTime.MinValue instead of null.using System;DateTime current = null;error CS0037: Cannot convert null to 'DateTime'because it is a non-nullable value typeMinValue example. We can use a special value like DateTime.MinValue to initialize an empty DateTime. This is the same idea as a null or uninitialized DateTime.DateTime.MinValueusing System;// This program can be compiled.// ... Use MinValue instead of null.DateTime current = DateTime.MinValue;Console.WriteLine("MIN VALUE: {0}", current);MIN VALUE: 1/1/0001 12:00:00 AMNullable. We can never have a null DateTime instance. DateTime is a value type. But we can use a nullable DateTime. We use a question mark "DateTime?" for this type.NullableHere We introduce the TestNullable() method. It receives a nullable DateTime, and uses HasValue and Value to test it.Start We begin by creating a nullable DateTime and initializing it to Today. Then we create a null DateTime.using System;class Program{ static void TestNullable(DateTime? argument) { // Handle nullable DateTime. if (argument.HasValue) { Console.WriteLine("VALUE: {0}", argument.Value); Console.WriteLine("VALUE YEAR: {0}", argument.Value.Year); } else { Console.WriteLine("NULL"); } } static void Main() { // Call method with nullable DateTime. DateTime? value = DateTime.Today; TestNullable(value); DateTime? value2 = null; TestNullable(value2); }}VALUE: 5/14/2019 12:00:00 AMVALUE YEAR: 2019NULLSort. An array or List of DateTime structs can be sorted. This will go from low to high (early to later) in an ascending sort by default.Sort DateTime Listusing System;using System.Collections.Generic;var values = new List();values.Add(new DateTime(2023, 1, 1));values.Add(new DateTime(2021, 1, 1));values.Add(new DateTime(2022, 1, 1));// Sort the dates.values.Sort();// The dates have been sorted from first to last chronologically.foreach (var value in values){ Console.WriteLine(value);}1/1/2021 12:00:00AM1/1/2022 12:00:00AM1/1/2023 12:00:00AMBenchmark, DateTime cache. Here is a way to optimize DateTime usage. When a method calls DateTime.Now, we can sometimes cache this value. This prevents excessive time queries.Info Using DateTime.Now is slower than most property accesses as it must fetch the time from the OS.Version 1 We get a new time only every 20 accesses. This cache makes sense if the current time is queried millions of times rapidly.Version 2 While version 2 gets DateTime.Now each time—no caching layer is introduced.Result Using a cached value is faster, although .NET 7 in 2023 has made creating a DateTime much faster than before.using System;using System.Diagnostics;static class DateTimeNowCache{ const int _count = 20; static DateTime _recentTime = DateTime.Now; static int _skipped; public static DateTime GetDateTime() { // Get a new DateTime.Now every several requests. // ... This reduces the number

How to calculate difference between two datetimes?

UTC, we can write:123456# Python 3.2 or higher requiredfrom datetime import datetime, timezonedt = datetime( 2021, 3, 5, 14, 30, 21, tzinfo=timezone.utc )timestamp = int( dt.timestamp() )print( timestamp )Convert Unix Timestamp to datetimeIf we want to find out what date and time a specific Unix timestamp represents, we can convert the timestamp to a datetime object.For example, to convert a Unix timestamp to a datetime in the system's local time zone, we can write:12345from datetime import datetimetimestamp = 1614983421dt = datetime.fromtimestamp( timestamp )print( dt )On Python versions 3.2 and higher, we can use the timezone class to convert Unix timestamps into other time zones. For example, to get the UTC datetime corresponding to the Unix timestamp 1614954621, we can write:123456# Python 3.2 or higher requiredfrom datetime import datetime, timezonetimestamp = 1614954621dt = datetime.fromtimestamp( timestamp, tz=timezone.utc )print( dt )Referencestime — Time access and conversions — Python 3 documentationdatetime — Basic date and time types — Python 3 documentation. IPv4 CIDR Calculator. IPv6 Converter. IPv6 CIDR Calculator. Netmask Calculator. Datetime Converters. Unix Time Converter. Datetime Difference Calculator. Number Converters. Unix Using DateTime class. This approach uses the DateTime class to create DateTime objects for the birth date and current date. It then calculates the difference between the two dates using diff and extracts the number of years from the difference. Example: This example uses the DateTime class to calculate age in years in PHP. PHP

datetime - Date calculations in C - Stack Overflow

Year. We use an overloaded method. With overloading, we often can use methods in an easier, clearer way.OverloadDetail If we want the current year, we can call FirstDayOfYear with no parameter. The year from Today will be used.using System;class Program{ static void Main() { Console.WriteLine("First day: {0}", FirstDayOfYear()); DateTime d = new DateTime(1999, 6, 1); Console.WriteLine("First day of 1999: {0}", FirstDayOfYear(d)); } /// /// Gets the first day of the current year. /// static DateTime FirstDayOfYear() { return FirstDayOfYear(DateTime.Today); } /// /// Finds the first day of year of the specified day. /// static DateTime FirstDayOfYear(DateTime y) { return new DateTime(y.Year, 1, 1); }}First day: 1/1/2008 12:00:00 AMFirst day of 1999: 1/1/1999 12:00:00 AMLast day. Here we find the last day in any year. Leap years make this more complicated, as February may have 28 or 29 days. We must programmatically find the year's length.Tip This method is ideal for when you want to count days, as for a database range query for a certain year.Tip 2 It is better to use the DateTime constructor, rather than DateTime.Parse. This is faster and has clearer syntax.using System;class Program{ static void Main() { Console.WriteLine("Last day: {0}", LastDayOfYear()); DateTime d = new DateTime(1999, 6, 1); Console.WriteLine("Last day of 1999: {0}", LastDayOfYear(d)); } /// /// Finds the last day of the year for today. /// static DateTime LastDayOfYear() { return LastDayOfYear(DateTime.Today); } /// /// Finds the last day of the year for the selected day's year. /// static DateTime LastDayOfYear(DateTime d) { // Get first of next year. DateTime n = new DateTime(d.Year + 1, 1, 1); // Subtract one from it. return n.AddDays(-1); }}Last day: 12/31/2008 12:00:00 AMLast day of 1999: 12/31/1999 12:00:00 AMNow, UtcNow. The Now property returns the current DateTime, with all of the fields correctly filled. UtcNow is Universal Coordinated Time, or Greenwich MeanTime.Tip The Now property returns the time as a local time, which means it depends on the time zone of the current computer configuration.DateTime.Nowusing System;var now = DateTime.Now;var utc = DateTime.UtcNow;// UTC is Greenwich MeanTime.Console.WriteLine("LOCAL: {0}", now);Console.WriteLine("UTC: {0}", utc);LOCAL: 3/14/2020 3:17:55 AMUTC: 3/14/2020 10:17:55 AMParse. It is possible to parse DateTime instances. This converts a string value into a DateTime. The "Try" methods avoid expensive exceptions on invalid strings.Here The program uses TryParse in an if-statement. If the parsing is successful, we print the RESULT line.DateTime.TryParseTip If we know that the string is a correct date, we can use Parse. But this will throw an exception on invalid data.DateTime.Parseusing System;string value = "3/13/2020";// Use TryParse to convert from string to DateTime.if (DateTime.TryParse(value, out DateTime result)){ Console.WriteLine("RESULT: {0}", result);}RESULT: 3/13/2020 12:00:00 AMSubtract DateTime. We find the "age" of a certain date, and how long ago it was in time. We can do this with DateTime.Subtract, which will return a TimeSpan.DateTime SubtractTip To get the number of days ago a date occurred, we can use the DateTime.Now property.using System;string value1 = "3/13/2020";string value2 = "3/14/2020";// Parse the dates.var date1 = DateTime.Parse(value1);var date2 = DateTime.Parse(value2);// Compute the difference between the