Handle relative times.
Handle relative times.

In addition to specifying date ranges as (start date) - (end date), you can specify relative dates with '+(seconds)', '-(seconds)', '(number) (units) ago', '(number) (units) from now', or 'now'.  For instance, '+7200' is two hours from the current time, '-86400' is one day before the current time.  This could instead be expressed as '2 hours from now' and '1 day ago'.  Units are anything momentjs knows how to handle.  Numbers may be float values.

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