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C# DateTime Subtract Method
Use the DateTime.Subtract method. Subtract computes differences between 2 dates.DateTime Subtract. One DateTime can be subtracted from another. This returns the difference in time between the 2 dates. For example, the difference between December 25 and January 1 in the year 2008 is seven days.
Example. We use the Subtract method with one argument on the DateTime struct instance. You can use Subtract to get the difference between 2 dates. You must subtract the smaller date from the larger date.Struct
Next: We see that the difference between Christmas (December 25) and New Year's Day (January 1) is seven days at the end of 2008.
Info: Note how the DateTime constructors are passed three arguments. These specify the year, the month, and the day.
Negative TimeSpans: If you subtract a later date from an earlier date, you can receive a negative TimeSpan value.
Note: For example, change the "newYears" parameters to be the year 2007, and you will get -724 days (negative time).
C# program that uses DateTime.Subtract
using System;
class Program
{
static void Main()
{
// Create DateTime instances for December 25 and January 1.
// ... Then compute the difference with Subtract.
// ... Write the result.
DateTime christmas = new DateTime(2008, 12, 25);
DateTime newYears = new DateTime(2009, 1, 1);
TimeSpan span = newYears.Subtract(christmas);
Console.WriteLine(span);
Console.WriteLine("{0} days", span.TotalDays);
}
}
Output
7.00:00:00
7 days
Discussion. Each DateTime struct stores a ticks field—this is a long type representation of the time. When using Subtract, the long fields from the two DateTime instances are simply subtracted.Long and ulong Types
And: This can be implemented using low-level intermediate language. Please look inside Subtract with IL Disassembler.
IL Disassembler TutorialSummary. We saw the DateTime type and its Subtract instance method. This method receives one argument and returns a TimeSpan instance indicating the elapsed time. Typically we subtract a smaller and earlier date from the larger date.DateTime
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- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression