Question

In SQL Server(T-SQL) you can convert a DateTime variable to a a decimal values like this:

CONVERT(DECIMAL(20,10),@mytime)
Sample Input: 2012-07-27 08:29:20.000
Sample Output: 41115.3537037037

Is there any equivalent method of converting a DateTime in .NET(C# or VB) to the same type of decimal?

I am looking to compare times on different days.

Calculating

41115.3537037037 % 1 = .3537037037

This would allow me to easily compare times on different dates.

Answer 1

It looks like this is “number of days since 1st January 1900”. In which case, you’d use:

DateTime epoch = new DateTime(1900, 1, 1);
TimeSpan difference = date - epoch;
double days = difference.TotalDays;