-(other) public

Returns a new TimeWithZone object that represents the difference between the current object’s time and the other time.

Time.zone = 'Eastern Time (US & Canada)' # => 'Eastern Time (US & Canada)'
now = Time.zone.now # => Mon, 03 Nov 2014 00:26:28 EST -05:00
now - 1000          # => Mon, 03 Nov 2014 00:09:48 EST -05:00

If subtracting a Duration of variable length (i.e., years, months, days), move backward from #time, otherwise move backward from #utc, for accuracy when moving across DST boundaries.

For instance, a time - 24.hours will go subtract exactly 24 hours, while a time - 1.day will subtract 23-25 hours, depending on the day.

now - 24.hours      # => Sun, 02 Nov 2014 01:26:28 EDT -04:00
now - 1.day         # => Sun, 02 Nov 2014 00:26:28 EDT -04:00
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