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DateTime Constructor (Int64)

Initializes a new instance of the DateTime structure to a specified number of ticks.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public DateTime(
	long ticks


Type: System.Int64
A date and time expressed in the number of 100-nanosecond intervals that have elapsed since January 1, 0001 at 00:00:00.000 in the Gregorian calendar.


ticks is less than DateTime.MinValue or greater than DateTime.MaxValue.

The Kind property is initialized to Unspecified.

For applications in which portability of date and time data or a limited degree of time zone awareness is important, you can use the corresponding DateTimeOffset constructor.

The following example demonstrates one of the DateTime constructors.

// This example demonstrates the DateTime(Int64) constructor.
using System;
using System.Globalization;

class Sample 
    public static void Main() 
// Instead of using the implicit, default "G" date and time format string, we 
// use a custom format string that aligns the results and inserts leading zeroes.
    string format = "{0}) The {1} date and time is {2:MM/dd/yyyy hh:mm:ss tt}";

// Create a DateTime for the maximum date and time using ticks.
    DateTime dt1 = new DateTime(DateTime.MaxValue.Ticks);

// Create a DateTime for the minimum date and time using ticks.
    DateTime dt2 = new DateTime(DateTime.MinValue.Ticks);

// Create a custom DateTime for 7/28/1979 at 10:35:05 PM using a 
// calendar based on the "en-US" culture, and ticks. 
    long ticks = new DateTime(1979, 07, 28, 22, 35, 5, 
	new CultureInfo("en-US", false).Calendar).Ticks;
    DateTime dt3 = new DateTime(ticks);

    Console.WriteLine(format, 1, "maximum", dt1);
    Console.WriteLine(format, 2, "minimum", dt2);
    Console.WriteLine(format, 3, "custom ", dt3);
    Console.WriteLine("\nThe custom date and time is created from {0:N0} ticks.", ticks);
This example produces the following results:

1) The maximum date and time is 12/31/9999 11:59:59 PM
2) The minimum date and time is 01/01/0001 12:00:00 AM
3) The custom  date and time is 07/28/1979 10:35:05 PM

The custom date and time is created from 624,376,461,050,000,000 ticks.


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.