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# Time - a module for dealing with dates and times
use ./time_defs.h
enum Weekday(Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday)
struct TimeInfo(year,month,day,hour,minute,second,nanosecond:Int, weekday:Weekday, day_of_year:Int, timezone:Text)
struct Time(tv_sec:Int64, tv_usec:Int64; extern):
func now(->Time):
return inline C : Time {
struct timespec ts;
if (clock_gettime(CLOCK_REALTIME, &ts) != 0)
fail("Couldn't get the time!");
(Time){.tv_sec=ts.tv_sec, .tv_usec=ts.tv_nsec/1000};
}
func local_timezone(->Text):
inline C {
if (_local_timezone.length < 0) {
static char buf[PATH_MAX];
ssize_t len = readlink("/etc/localtime", buf, sizeof(buf));
if (len < 0)
fail("Could not get local tz!");
char *zoneinfo = strstr(buf, "/zoneinfo/");
if (zoneinfo)
_local_timezone = Text$from_str(zoneinfo + strlen("/zoneinfo/"));
else
fail("Could not resolve local tz!");
}
}
return inline C : Text { _local_timezone; }
func set_local_timezone(timezone:Text):
inline C {
setenv("TZ", Text$as_c_string(_$timezone), 1);
_local_timezone = _$timezone;
tzset();
}
func format(t:Time, format="%c", timezone=Time.local_timezone() -> Text):
return inline C : Text {
struct tm result;
time_t time = _$t.tv_sec;
struct tm *final_info;
WITH_TIMEZONE(_$timezone, final_info = localtime_r(&time, &result));
static char buf[256];
size_t len = strftime(buf, sizeof(buf), String(_$format), final_info);
Text$from_strn(buf, len);
}
func new(year,month,day:Int, hour=0, minute=0, second=0.0, timezone=Time.local_timezone() -> Time):
return inline C : Time{
struct tm info = {
.tm_min=Int32$from_int(_$minute, false),
.tm_hour=Int32$from_int(_$hour, false),
.tm_mday=Int32$from_int(_$day, false),
.tm_mon=Int32$from_int(_$month, false) - 1,
.tm_year=Int32$from_int(_$year, false) - 1900,
.tm_isdst=-1,
};
time_t t;
WITH_TIMEZONE(_$timezone, t = mktime(&info));
(Time){.tv_sec=t + (time_t)_$second, .tv_usec=(suseconds_t)(fmod(_$second, 1.0) * 1e9)};
}
func unix_timestamp(t:Time -> Int64):
return inline C : Int64 { (int64_t)_$t.tv_sec }
func from_unix_timestamp(timestamp:Int64 -> Time):
return inline C : Time { (Time){.tv_sec=_$timestamp}; }
func seconds_till(t:Time, target:Time -> Num):
seconds := Num(target.tv_sec - t.tv_sec)
seconds += 1e-9*Num(target.tv_usec - t.tv_usec)
return seconds
func minutes_till(t:Time, target:Time -> Num):
return t:seconds_till(target)/60.
func hours_till(t:Time, target:Time -> Num):
return t:seconds_till(target)/3600.
func relative(t:Time, relative_to=Time.now(), timezone=Time.local_timezone() -> Text):
inline C {
struct tm info = {};
struct tm relative_info = {};
WITH_TIMEZONE(_$timezone, {
localtime_r(&_$t.tv_sec, &info);
localtime_r(&_$relative_to.tv_sec, &relative_info);
});
double second_diff = _$time$Time$seconds_till(_$relative_to, _$t);
if (info.tm_year != relative_info.tm_year && fabs(second_diff) > 365.*24.*60.*60.)
return num_format((long)info.tm_year - (long)relative_info.tm_year, "year");
else if (info.tm_mon != relative_info.tm_mon && fabs(second_diff) > 31.*24.*60.*60.)
return num_format(12*((long)info.tm_year - (long)relative_info.tm_year) + (long)info.tm_mon - (long)relative_info.tm_mon, "month");
else if (info.tm_yday != relative_info.tm_yday && fabs(second_diff) > 24.*60.*60.)
return num_format(round(second_diff/(24.*60.*60.)), "day");
else if (info.tm_hour != relative_info.tm_hour && fabs(second_diff) > 60.*60.)
return num_format(round(second_diff/(60.*60.)), "hour");
else if (info.tm_min != relative_info.tm_min && fabs(second_diff) > 60.)
return num_format(round(second_diff/(60.)), "minute");
else {
if (fabs(second_diff) < 1e-6)
return num_format((long)(second_diff*1e9), "nanosecond");
else if (fabs(second_diff) < 1e-3)
return num_format((long)(second_diff*1e6), "microsecond");
else if (fabs(second_diff) < 1.0)
return num_format((long)(second_diff*1e3), "millisecond");
else
return num_format((long)(second_diff), "second");
}
}
fail("Unreachable")
func time(t:Time, seconds=no, am_pm=yes, timezone=Time.local_timezone() -> Text):
time := if seconds and am_pm:
t:format("%l:%M:%S%P")
else if seconds and not am_pm:
t:format("%T")
else if not seconds and am_pm:
t:format("%l:%M%P")
else:
t:format("%H:%M")
return time:trim()
func date(t:Time, timezone=Time.local_timezone() -> Text):
return t:format("%F")
func info(t:Time, timezone=Time.local_timezone() -> TimeInfo):
return inline C : TimeInfo {
struct tm info = {};
WITH_TIMEZONE(_$timezone, localtime_r(&_$t.tv_sec, &info));
(_$time$TimeInfo$$type){
.year = I(info.tm_year + 1900),
.month = I(info.tm_mon + 1),
.day = I(info.tm_mday),
.hour = I(info.tm_hour),
.minute = I(info.tm_min),
.second = I(info.tm_sec),
.nanosecond = I(_$t.tv_usec),
.weekday = (_$time$Weekday$$type){.$tag=info.tm_wday + 1},
.day_of_year = I(info.tm_yday),
.timezone = _$timezone,
};
}
func after(t:Time, seconds=0.0, minutes=0.0, hours=0.0, days=0, weeks=0, months=0, years=0, timezone=Time.local_timezone() -> Time):
return inline C : Time {
double offset = _$seconds + 60.*_$minutes + 3600.*_$hours ;
_$t.tv_sec += (time_t)offset;
struct tm info = {};
WITH_TIMEZONE(_$timezone, localtime_r(&_$t.tv_sec, &info));
info.tm_mday += Int32$from_int(_$days, false) + 7*Int32$from_int(_$weeks, false);
info.tm_mon += Int32$from_int(_$months, false);
info.tm_year += Int32$from_int(_$years, false);
time_t t = mktime(&info);
(Time){
.tv_sec=t,
.tv_usec=_$t.tv_usec + (suseconds_t)(fmod(offset, 1.0) * 1e9),
};
}
func parse(text:Text, format="%Y-%m-%dT%H:%M:%S%z", timezone=Time.local_timezone() -> Time?):
return inline C : Time? {
struct tm info = {.tm_isdst=-1};
const char *str = Text$as_c_string(_$text);
const char *fmt = Text$as_c_string(_$format);
if (strstr(fmt, "%Z"))
fail("The %Z specifier is not supported for time parsing!");
char *invalid;
WITH_TIMEZONE(_$timezone, invalid = strptime(str, fmt, &info));
if (!invalid || invalid[0] != '\0')
return (_$time$$OptionalTime$$type){.is_none=true};
long offset = info.tm_gmtoff; // Need to cache this because mktime() mutates it to local tz >:(
time_t t;
WITH_TIMEZONE(_$timezone, t = mktime(&info));
(_$time$$OptionalTime$$type){.value={.tv_sec=t + offset - info.tm_gmtoff}};
}
func _run_tests():
>> Time.now():format()
>> Time.set_local_timezone("Europe/Paris")
>> Time.now():format()
>> Time.set_local_timezone("America/New_York")
>> Time.now():format()
# >> Time.now():format(timezone="Europe/Paris")
# >> Time.now():format()
# >> Time.now():format("%Y-%m-%d")
# >> Time.new(2023, 11, 5):format()
# >> Time.local_timezone()
# >> Time.new(2023, 11, 5):seconds_till(Time.now())
# >> Time.new(2023, 11, 5):relative()
# >> Time.now():info()
# >> Time.now():time()
# >> Time.now():date()
# >> Time.parse("2023-11-05 01:01", "%Y-%m-%d %H:%M")
# >> Time.parse("2023-11-05 01:01", "%Y-%m-%d %H:%M", timezone="Europe/Paris")
func main():
_run_tests()
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