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Viewing File: _datetime_impl.py
"""
PRIVATE MODULE: do not import (from) it directly.
This module contains functionality for ``datetime`` related stuff.
"""
from datetime import datetime, timezone, timedelta, time, date
from typing import Union
RFC3339_DATE_PATTERN = '%Y-%m-%d'
RFC3339_TIME_PATTERN = '%H:%M:%S'
RFC3339_DATETIME_PATTERN = '{}T{}'.format(
RFC3339_DATE_PATTERN, RFC3339_TIME_PATTERN)
def to_str(
dt: Union[datetime, date],
strip_microseconds: bool,
fork_inst: type,
pattern: str = RFC3339_DATETIME_PATTERN) -> str:
offset = get_offset_str(dt, fork_inst)
if not strip_microseconds and getattr(dt, 'microsecond', None):
pattern += '.%f'
return dt.strftime("{}{}".format(pattern, offset))
def get_offset_str(
obj: Union[datetime, date, timedelta],
fork_inst: type) -> str:
"""
Return the textual offset of the given ``obj``.
:param obj: a datetime or timedelta instance.
:param fork_inst: the state holder that is used.
:return: the offset following RFC3339.
"""
result = ''
if isinstance(obj, datetime):
result = _datetime_offset_str(obj, fork_inst)
elif isinstance(obj, timedelta):
result = _timedelta_offset_str(obj)
return result
def get_datetime_inst(obj: str, pattern: str) -> datetime:
"""
Return a datetime instance with timezone info from the given ``obj``.
:param obj: the ``obj`` in RFC3339 format.
:param pattern: the datetime pattern.
:return: a datetime instance with timezone info.
"""
if obj[-1] == 'Z':
result = _datetime_utc_inst(obj, pattern)
elif 'T' in pattern:
result = _datetime_offset_inst(obj, pattern)
else:
result = datetime.strptime(obj, pattern)
return result
def _datetime_offset_str(obj: datetime, fork_inst: type) -> str:
"""
Return a textual offset (e.g. +01:00 or Z) for the given datetime.
:param obj: the datetime instance.
:return: the offset for ``obj``.
"""
tzone = obj.tzinfo
if not tzone:
# datetimes without tzinfo are treated as local times.
fork_inst._warn('The use of datetimes without timezone is dangerous '
'and can lead to undesired results.',
'datetime-without-tz')
tzone = datetime.now(timezone.utc).astimezone().tzinfo
if tzone is timezone.utc or tzone.utc is timezone.utc:
return '+00:00'
offset = 'Z'
if tzone.tzname(None) not in ('UTC', 'UTC+00:00'):
tdelta = tzone.utcoffset(None) or \
getattr(tzone, 'adjusted_offset', tzone.utcoffset(obj))
offset = _timedelta_offset_str(tdelta)
return offset
def _timedelta_offset_str(tdelta: timedelta) -> str:
"""
Return a textual offset (e.g. +01:00 or Z) for the given timedelta.
:param tdelta: the timedelta instance.
:return: the offset for ``tdelta``.
"""
offset_s = tdelta.total_seconds()
offset_h = int(offset_s / 3600)
offset_m = int((offset_s / 60) % 60)
offset_t = time(abs(offset_h), abs(offset_m))
operator = '+' if offset_s > 0 else '-'
offset = offset_t.strftime('{}%H:%M'.format(operator))
return offset
def _datetime_utc_inst(obj: str, pattern: str) -> datetime:
"""
Return a datetime instance with UTC timezone info.
:param obj: a datetime in RFC3339 format.
:param pattern: the datetime pattern that is used.
:return: a datetime instance with timezone info.
"""
dattim_str = obj[0:-1]
dattim_obj = datetime.strptime(dattim_str, pattern)
return _new_datetime(dattim_obj.date(), dattim_obj.time(), timezone.utc)
def _datetime_offset_inst(obj: str, pattern: str) -> datetime:
"""
Return a datetime instance with timezone info.
:param obj: a datetime in RFC3339 format.
:param pattern: the datetime pattern that is used.
:return: a datetime instance with timezone info.
"""
dat_str, tim_str = obj.split('T')
splitter, factor = ('+', 1) if '+' in tim_str else ('-', -1)
naive_tim_str, offset = tim_str.split(splitter)
naive_dattim_str = '{}T{}'.format(dat_str, naive_tim_str)
dattim_obj = datetime.strptime(naive_dattim_str, pattern)
hrs_str, mins_str = offset.split(':')
hrs = int(hrs_str) * factor
mins = int(mins_str) * factor
tz = timezone(offset=timedelta(hours=hrs, minutes=mins))
return _new_datetime(dattim_obj.date(), dattim_obj.time(), tz)
def _new_datetime(date_inst: date, time_inst: time, tzinfo: timezone) \
-> datetime:
"""
Return a datetime instance from a date, time and timezone.
This function was required due to the missing argument for tzinfo under the
Linux Python distribution.
:param date_inst: the date.
:param time_inst: the time.
:param tzinfo: the Timezone.
:return: a combined datetime instance.
"""
return datetime.combine(date_inst, time_inst).replace(tzinfo=tzinfo)
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