How to convert a negative value to positive

From: Angus Comber (ac_at_NOiteloffice.com.PLEASENOSPAM)
Date: 11/28/04 

Date: Sat, 27 Nov 2004 23:27:45 -0000

Hello

Sorry this really is a newbie question!

I am doing some floating point arithmetic and calculating the time
difference between two dates. The date values being comparied are actually
double values. I was going to compare the dates by calculating the
difference betwen the two numbers. But sometimes you get a -ve and
sometimes a +ve value. I want to disregard a small variance eg of up to two
minutes but what is best way to compare values.

ie calculate difference and then convert any -ve values to +ve then check if
(diff > x)

or some other way?

AC

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