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Date Arithmetic
===============

The commands described in this section perform various conversions and
calculations involving date forms (See 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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Date Conversions
Date Functions
Time Zones
Business Days