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Merge pull request #1704 from amano-kenji/os/date

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Document how to set local timezone for os/date and os/strftime.
This commit is contained in:
Calvin Rose
2026-01-28 21:37:43 -06:00
committed by GitHub
parent 4c21dc3c06 87b1bf1a66
commit a5c4e929e8
1 changed files with 6 additions and 4 deletions
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src/core/os.c
+6 -4
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@@ -1893,9 +1893,8 @@ static struct tm *time_to_tm(const Janet *argv, int32_t argc, int32_t n, struct
JANET_CORE_FN(os_date,
"(os/date &opt time local)",
"Returns the given time as a date struct, or the current time if `time` is not given. "
"Returns a struct with following key values. Note that all numbers are 0-indexed. "
"Date is given in UTC unless `local` is truthy, in which case the date is formatted for "
"the local timezone.\n\n"
"the local timezone. Returns a struct with following key values. Note that all numbers are 0-indexed.\n\n"
"* :seconds - number of seconds [0-61]\n\n"
"* :minutes - number of minutes [0-59]\n\n"
"* :hours - number of hours [0-23]\n\n"
@@ -1904,7 +1903,9 @@ JANET_CORE_FN(os_date,
"* :year - years since year 0 (e.g. 2019)\n\n"
"* :week-day - day of the week [0-6]\n\n"
"* :year-day - day of the year [0-365]\n\n"
"* :dst - if Day Light Savings is in effect") {
"* :dst - if Day Light Savings is in effect\n\n"
"You can set local timezone by setting TZ environment variable. "
"See tzset(<time.h>) or _tzset(<time.h>) for further details.") {
janet_arity(argc, 0, 2);
(void) argv;
struct tm t_infos;
@@ -1929,7 +1930,8 @@ JANET_CORE_FN(os_strftime,
"Format the given time as a string, or the current time if `time` is not given. "
"The time is formatted according to the same rules as the ISO C89 function strftime(). "
"The time is formatted in UTC unless `local` is truthy, in which case the date is formatted for "
"the local timezone.") {
"the local timezone. You can set local timezone by setting TZ environment variable. "
"See tzset(<time.h>) or _tzset(<time.h>) for further details.") {
janet_arity(argc, 1, 3);
const char *fmt = janet_getcstring(argv, 0);
/* ANSI X3.159-1989, section 4.12.3.5 "The strftime function" */