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These functions perform calendrical computations using time values
(the kind of list that `current-time`

returns).

— Function: **time-subtract**` t1 t2`

This returns the time difference

t1−t2between two time values, in the same format as a time value.

— Function: **time-add**` t1 t2`

This returns the sum of two time values, one of which ought to represent a time difference rather than a point in time. Here is how to add a number of seconds to a time value:

(time-addtime(seconds-to-timeseconds))

— Function: **time-to-days**` time`

This function returns the number of days between the beginning of year 1 and

time.