calc: Date Arithmetic
8.5 Date Arithmetic
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The commands described in this section perform various conversions and
calculations involving date forms (
Date Forms). They use the
‘t’ (for time/date) prefix key followed by shifted letters.
The simplest date arithmetic is done using the regular ‘+’ and ‘-’
commands. In particular, adding a number to a date form advances the
date form by a certain number of days; adding an HMS form to a date form
advances the date by a certain amount of time; and subtracting two date
forms produces a difference measured in days. The commands described
here provide additional, more specialized operations on dates.
Many of these commands accept a numeric prefix argument; if you give
plain ‘C-u’ as the prefix, these commands will instead take the
additional argument from the top of the stack.
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