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# Copyright (C) 2018 Philipp Hörist <philipp AT hoerist.com>
#
# This file is part of nbxmpp.
#
# SPDX-License-Identifier: GPL-3.0-or-later
import datetime as dt
import logging
import re
import time
log = logging.getLogger("nbxmpp.m.date_and_time")
PATTERN_DATETIME = re.compile(
r"""
([0-9]{4}-[0-9]{2}-[0-9]{2}) # Date
T # Separator
([0-9]{2}:[0-9]{2}:[0-9]{2}) # Time
(?P<frac>\.[0-9]{0,6})? # Fractual Seconds
[0-9]* # lose everything > 6
(Z|[-+][0-9]{2}:[0-9]{2}) # UTC Offset
$ # End of String
""",
re.VERBOSE,
)
ZERO = dt.timedelta(0)
HOUR = dt.timedelta(hours=1)
SECOND = dt.timedelta(seconds=1)
STDOFFSET = dt.timedelta(seconds=-time.timezone)
if time.daylight:
dstoffset = dt.timedelta(seconds=-time.altzone)
else:
dstoffset = STDOFFSET
DSTOFFSET = dstoffset
DSTDIFF = DSTOFFSET - STDOFFSET
class LocalTimezone(dt.tzinfo):
"""
A class capturing the platform's idea of local time.
May result in wrong values on historical times in
timezones where UTC offset and/or the DST rules had
changed in the past.
"""
def fromutc(self, dt_input: dt.datetime) -> dt.datetime:
stamp = (dt_input - dt.datetime(1970, 1, 1, tzinfo=self)) // SECOND
args = time.localtime(stamp)[:6]
dst_diff = DSTDIFF // SECOND
# Detect fold
fold = args == time.localtime(stamp - dst_diff)
return dt.datetime(
*args, microsecond=dt_input.microsecond, tzinfo=self, fold=fold
)
def utcoffset(self, dt_input: dt.datetime) -> dt.timedelta: # type: ignore
if self._isdst(dt_input):
return DSTOFFSET
return STDOFFSET
def dst(self, dt_input: dt.datetime) -> dt.timedelta: # type: ignore
if self._isdst(dt_input):
return DSTDIFF
return ZERO
def tzname(self, _dt_input: dt.datetime) -> str: # type: ignore
return "local"
@staticmethod
def _isdst(dt_input: dt.datetime) -> bool:
tt = (
dt_input.year,
dt_input.month,
dt_input.day,
dt_input.hour,
dt_input.minute,
dt_input.second,
dt_input.weekday(),
0,
0,
)
stamp = time.mktime(tt)
tt = time.localtime(stamp)
return tt.tm_isdst > 0
def create_tzinfo(
hours: int = 0, minutes: int = 0, tz_string: str | None = None
) -> dt.timezone | None:
if tz_string is None:
return dt.timezone(dt.timedelta(hours=hours, minutes=minutes))
if tz_string.lower() == "z":
return dt.timezone.utc
try:
hours, minutes = map(int, tz_string.split(":"))
except Exception:
log.warning("Wrong tz string: %s", tz_string)
return None
if hours not in range(-24, 24):
log.warning("Wrong tz string: %s", tz_string)
return None
if minutes not in range(59):
log.warning("Wrong tz string: %s", tz_string)
return None
if hours in (24, -24) and minutes != 0:
log.warning("Wrong tz string: %s", tz_string)
return None
return dt.timezone(dt.timedelta(hours=hours, minutes=minutes))
def parse_datetime(
timestring: str | None,
check_utc: bool = False,
convert: str | None = "utc",
epoch: bool = False,
) -> dt.datetime | float | None:
"""
Parse a XEP-0082 DateTime Profile String
:param timestring: a XEP-0082 DateTime profile formated string
:param check_utc: if True, returns None if timestring is not
a timestring expressing UTC
:param convert: convert the given timestring to utc or local time
:param epoch: if True, returns the time in epoch
Examples:
'2017-11-05T01:41:20Z'
'2017-11-05T01:41:20.123Z'
'2017-11-05T01:41:20.123+05:00'
return a datetime or epoch
"""
if timestring is None:
return None
if convert not in (None, "utc", "local"):
raise TypeError('"%s" is not a valid value for convert')
match = PATTERN_DATETIME.match(timestring)
if match is None:
return None
timestring = "".join(match.groups(""))
strformat = "%Y-%m-%d%H:%M:%S%z"
if match.group("frac"):
# Fractional second addendum to Time
strformat = "%Y-%m-%d%H:%M:%S.%f%z"
try:
date_time = dt.datetime.strptime(timestring, strformat)
except ValueError:
return None
if not 1 < date_time.year < 9999:
# Raise/Reduce MIN/MAX year so converting to different
# timezones cannot get out of range
return None
if check_utc:
if convert != "utc":
raise ValueError('check_utc can only be used with convert="utc"')
if date_time.tzinfo != dt.timezone.utc:
return None
if epoch:
return date_time.timestamp()
return date_time
if convert == "utc":
date_time = date_time.astimezone(dt.timezone.utc)
if epoch:
return date_time.timestamp()
return date_time
if epoch:
# epoch is always UTC, use convert='utc' or check_utc=True
raise ValueError("epoch not available while converting to local")
if convert == "local":
date_time = date_time.astimezone(LocalTimezone())
return date_time
# convert=None
return date_time
def get_local_time() -> tuple[str, str]:
formated_time = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())
isdst = time.localtime().tm_isdst
zone = -(time.timezone, time.altzone)[isdst] / 60.0
zone = (zone / 60, abs(zone % 60))
tzo = "%+03d:%02d" % zone
return formated_time, tzo
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