NAME
DiffHhmmss — Do subtraction of time quantities in hh:mm:ss form.
SYNOPSIS
DiffHhmmss MinuendVariable Subtrahend
DESCRIPTION
Return Value
A string of the form hh:mm:ss that is the time left after subtracting.
Arguments
MinuendVariableWhat gets subtracted from.
SubtrahendHow much to subtract.
More Info
Note that the strings represent quantities of time, how long. The strings do not represent time points, times during the day.

For information regarding exceptions / errors, see here.
EXAMPLES

Here we subtract 30 minutes from 90 minutes and get back an hour.

% DiffHhmmss 01:30:00 00:30:00
01:00:00
SEE ALSO
IsHhmmss, MultiplyHhmmss, SumHhmmss
KEYWORDS
datetime, math, time