DateTimeExtensions for C#

DateTimeExtensions.cs

public static class DateTimeExtensions
{

	public static long ToUnixTime(this DateTime datetime)
	{
		DateTime epochDate = new DateTime(1970, 1, 1,0,0,0,DateTimeKind.Utc);
		return (long)(datetime - epochDate).TotalSeconds;
	}
	
	public static long ToJavaTime(this DateTime datetime)
	{
		var epochTicks = (new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).Ticks;
		return (long)((datetime.ToUniversalTime().Ticks - epochTicks) / 10000);
	}

}