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-(other)
public
Subtracts an interval of time and returns a new TimeWithZone object unless the other value acts_like? time. Then it will return a Float of the difference between the two times 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 00:26:28.725182881 EST -05:00 now - 1000 # => Mon, 03 Nov 2014 00:09:48.725182881 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 01:26:28.725182881 EDT -04:00 now - 1.day # => Sun, 02 Nov 2014 00:26:28.725182881 EDT -04:00
If both the TimeWithZone object and the other value act like Time, a Float will be returned.
Time.zone.now - 1.day.ago # => 86399.999967