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Improve documentation of 'date-to-time' and 'parse-time-string'

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* doc/lispref/os.texi (Time Parsing): Document
'parse-time-string', and refer to it for the description of
the argument of 'date-to-time'.

* lisp/calendar/time-date.el (date-to-time): Refer in the doc
string to 'parse-time-string' for more information about the
format of the DATE argument.  (Bug#34303)
This commit is contained in:
Eli Zaretskii 2019-02-08 10:33:13 +02:00
parent 46095a7dcb
commit b8c70172f3
2 changed files with 23 additions and 1 deletions
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23
doc/lispref/os.texi
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@ -1467,7 +1467,28 @@ integers (@pxref{Time of Day}).
@defun date-to-time string
This function parses the time-string @var{string} and returns the
corresponding time value.
corresponding time value. The argument @var{string} should represent
a date-time, and should be in one of the forms recognized by
@code{parse-time-string} (see below). This function assumes the GMT
timezone if @var{string} lacks an explicit timezone information.
@end defun
@defun parse-time-string string
This function parses the time-string @var{string} into a list of the
following form:
@example
(@var{sec} @var{min} @var{hour} @var{day} @var{mon} @var{year} @var{dow} @var{dst} @var{tz})
@end example
@noindent
The format of this list is the same as what @code{decode-time} accepts
(@pxref{Time Conversion}), and is described in more detail there. Any
element that cannot be determined from the input will be set to
@code{nil}. The argument @var{string} should resemble an RFC 2822 or
ISO 8601 string, like ``Fri, 25 Mar 2016 16:24:56 +0100'' or
``1998-09-12T12:21:54-0200'', but this function will attempt to parse
less well-formed time strings as well.
@end defun
@defun format-time-string format-string &optional time zone

1
lisp/calendar/time-date.el
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@ -148,6 +148,7 @@ it is assumed that PICO was omitted and should be treated as zero."
;; values. timezone-make-date-arpa-standard should help.
(defun date-to-time (date)
"Parse a string DATE that represents a date-time and return a time value.
DATE should be in one of the forms recognized by `parse-time-string'.
If DATE lacks timezone information, GMT is assumed."
(condition-case err
(apply 'encode-time (parse-time-string date))