GNU Emacs Calc 2.02 Manual
7.7.6 HMS Formats
The d h (
calc-hms-notation) command controls the display of
HMS (hours-minutes-seconds) forms. It prompts for a string which
consists basically of an "hours" marker, optional punctuation, a
"minutes" marker, more optional punctuation, and a "seconds" marker.
Punctuation is zero or more spaces, commas, or semicolons. The hours
marker is one or more non-punctuation characters. The minutes and
seconds markers must be single non-punctuation characters.
The default HMS format is `@ ' "', producing HMS values of the form
`23@ 30' 15.75"'. The format `deg, ms' would display this same
value as `23deg, 30m15.75s'. During numeric entry, the h or o
keys are recognized as synonyms for @ regardless of display format.
The m and s keys are recognized as synonyms for ' and
", respectively, but only if an @ (or h or o) has
already been typed; otherwise, they have their usual meanings
(m- prefix and s- prefix). Thus, 5 ", 0 @ 5 ", and
0 h 5 s are some of the ways to enter the quantity "five seconds."
The ' key is recognized as "minutes" only if @ (or h or
o) has already been pressed; otherwise it means to switch to algebraic