Apparently times and intervals are much more easy than I thought! I should actually read man pages sometime, instead of relying on tutorials.

       An interval defines a block of time that is tracked. The syntax for specifying an interval is flexible, and may 
be one of:

         [from] <date>
         [from] <date> to/- <date>
         [from] <date> for <duration>
         <duration> before/after <date>
         <duration> ago
         [for] <duration>

       Examples are:

         from 9:00
         from 9am - 11am
         from 9:00:00 to 11:00
         from 9:00 for 2h
         2h after 9am
         2h before 11:00
         2h ago
         for 2h

       An interval is said to be 'closed' if there is both a start and end, and 'open' if there is no end date.

Nice examples are, for example, w track 7min "something short" – which records something done the last X minutes including now, as a closed interval.


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