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[edit] Using the DateTime ToFileTime Method

The ToFileTime method converts the date to a long that represents the amount of 100 nanosecond chunks from the date January 1, 0001.

[edit] Example 1:

using System;
class Program
{
    static void Main()
    {
        DateTime d1 = DateTime.Now;
        long LongDate = d1.ToFileTime();
        Console.WriteLine(LongDate.ToString());
        Console.Read();
    }
}

This code will take your local computer time then calculate how many 100-nanosecond chunks from January 1, 0001.

<-- DateTime Tutorial