Question

TimeSpan Earlybeforetime = new TimeSpan();
Earlybeforetime = earlybefore.Subtract(Convert.ToDateTime(outtime);

Sometimes it returns a negative value. How do I convert the value to be always positive?

Answer 1

You could use Negate() to change the negative value to positive

From MSDN

If the date and time of the current instance is earlier than value,
the method returns a TimeSpan object that represents a negative time
span. That is, the value of all of its non-zero properties (such as
Days or Ticks) is negative.

So you could call the Negate method depending on which value is greater and obtain a positive Timespan

Say we have startDate and endDate (endDate is greater than startDate), so when we do
startDate.Subtract(endDate) we would get a negative TimeSpan. So based on this check you could convert the negative value. So if your outtime is ahead of earlybefore it would give you a negative TimeSpan

EDIT

Please check Duration() of the TimeSpan this should give you the absolute value always

Earlybeforetime.Duration()