Universal utility for calculate difference or sum between two dates and times. And many other things.
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Examples:
7 days - 15 hours — Subtract time
2005-03-28 - 1986-08-03 — Calculate elapsed time.
1986-08-03 - 2005-03-28 — Calculation of remaining time.
2005-03-28 16:45:00 + 1 min — Addition to the date and time of one minute
16:45:00 + 1 min — To add to the time of the current day 11 minutes
now + 2 hour - 11 min — To add to the current time 2 hours and subtract 11 minutes
now - 1986-08-03 — To subtract from the current time specified date. So let's calculate how much time has passed.
now - 3 week - (10 days + 11 hours) - (1 min * 30) + 12 min - 13 sec — An example of a complex calculation
now > 1999-01-01 — An example of a Boolean expression. If the current date is greater 1999-01-01 return true, otherwise false