diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | Doc/Zsh/mod_datetime.yo | 55 |
2 files changed, 43 insertions, 17 deletions
diff --git a/ChangeLog b/ChangeLog index 3f8e9e0e9..05d5b9721 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2015-02-21 Barton E. Schaefer <schaefer@zsh.org> + + * 34597: Doc/Zsh/mod_datetime.yo: Revise strftime description to + correctly explain timezone handling and note signed int rollover + 2015-02-20 Barton E. Schaefer <schaefer@zsh.org> * 34590: Src/exec.c, Src/text.c: queue_signals() around more diff --git a/Doc/Zsh/mod_datetime.yo b/Doc/Zsh/mod_datetime.yo index 619067698..27bc78157 100644 --- a/Doc/Zsh/mod_datetime.yo +++ b/Doc/Zsh/mod_datetime.yo @@ -8,25 +8,46 @@ findex(strftime) cindex(date string, printing) xitem(tt(strftime) [ tt(-s) var(scalar) ] var(format) var(epochtime) ) item(tt(strftime) tt(-r) [ tt(-q) ] [ tt(-s) var(scalar) ] var(format) var(timestring) )( -Output the date denoted by var(epochtime) in the var(format) -specified. +Output the date denoted by var(epochtime) in the var(format) specified. +See manref(strftime)(3) for details. The zsh extensions described in +ifzman(the section EXPANSION OF PROMPT SEQUENCES in zmanref(zshmisc))\ +ifnzman(noderef(Prompt Expansion)) are also available. -With the option tt(-r) (reverse), use the format var(format) to parse the -input string var(timestring) and output the number of seconds since the -epoch at which the time occurred. If no timezone is parsed, the current -timezone is used; other parameters are set to zero if not present. If -var(timestring) does not match var(format) the command returns status 1; it -will additionally print an error message unless the option tt(-q) (quiet) -is given. If var(timestring) matches var(format) but not all characters in -var(timestring) were used, the conversion succeeds; however, a warning is -issued unless the option tt(-q) is given. The matching is implemented by -the system function tt(strptime); see manref(strptime)(3). This means that -zsh format extensions are not available, however for reverse lookup they -are not required. If the function is not implemented, the command returns -status 2 and (unless tt(-q) is given) prints a message. +startitem() +item(tt(-q))( +Run quietly; suppress printing of all error messages described below. +Errors for invalid var(epochtime) values are always printed. +) +item(tt(-r))( +With the option tt(-r) (reverse), use var(format) to parse the input +string var(timestring) and output the number of seconds since the epoch at +which the time occurred. The parsing is implemented by the system +function tt(strptime); see manref(strptime)(3). This means that zsh +format extensions are not available, but for reverse lookup they are not +required. + +In most implementations of tt(strftime) any timezone in the +var(timestring) is ignored and the local timezone declared by the tt(TZ) +environment variable is used; other parameters are set to zero if not +present. + +If var(timestring) does not match var(format) the command returns status 1 +and prints an error message. If var(timestring) matches var(format) but +not all characters in var(timestring) were used, the conversion succeeds +but also prints an error message. + +If either of the system functions tt(strptime) or tt(mktime) is not +available, status 2 is returned and an error message is printed. +) +item(tt(-s) var(scalar))( +Assign the date string (or epoch time in seconds if tt(-r) is given) to +var(scalar) instead of printing it. +) +enditem() -If tt(-s) var(scalar) is given, assign the date string (or epoch time -in seconds if tt(-r) is given) to var(scalar) instead of printing it. +Note that depending on the system's declared integral time type, +tt(strftime) may produce incorrect results for epoch times greater than +2147483647 which corresponds to 2038-01-19 03:14:07 +0000. ) enditem() |