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Response to ... Compare DateTime in ASP.NET difference between Datetime
lingmaaki said... September 14, 2013 at 12:59 AM

try these also

DateTime newDate = new DateTime(2000, 5, 1);

String diff2 = (secondDate - firstDate).TotalDays.ToString();

source http://csharp.net-informations.com/statements/csharp-date-difference.htm

maaki