Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
import datetime
import math
import re
class TimezoneInfo(datetime.tzinfo):
def init(self, h, m):
self._name = “UTC”
if h != 0 and m != 0:
self._name += “%+03d:%2d” % (h, m)
self._delta = datetime.timedelta(hours=h, minutes=math.copysign(m, h))
def utcoffset(self, dt):
return self._delta
def tzname(self, dt):
return self._name
def dst(self, dt):
return datetime.timedelta(0)
UTC = TimezoneInfo(0, 0)
_re_rfc3339 = re.compile(r”(\d\d\d\d)-(\d\d)-(\d\d)” # full-date
r”[ Tt]” # Separator
r”(\d\d):(\d\d):(\d\d)([.,]\d+)?” # partial-time
r”([zZ ]|[-+]\d\d?:\d\d)?”, # time-offset
re.VERBOSE + re.IGNORECASE)
_re_timezone = re.compile(r”([-+])(\d\d?):?(\d\d)?”)
MICROSEC_PER_SEC = 1000000
def parse_rfc3339(s):
if isinstance(s, datetime.datetime):
# no need to parse it, just make sure it has a timezone.
if not s.tzinfo:
return s.replace(tzinfo=UTC)
return s
groups = _re_rfc3339.search(s).groups()
dt = [0] * 7
for x in range(6):
dt[x] = int(groups[x])
us = 0
if groups[6] is not None:
partial_sec = float(groups[6].replace(“,”, “.”))
us = int(MICROSEC_PER_SEC * partial_sec)
tz = UTC
if groups[7] is not None and groups[7] != ‘Z’ and groups[7] != ‘z’:
tz_groups = _re_timezone.search(groups[7]).groups()
hour = int(tz_groups[1])
minute = 0
if tz_groups[0] == “-“:
hour *= -1
if tz_groups[2]:
minute = int(tz_groups[2])
tz = TimezoneInfo(hour, minute)
return datetime.datetime(
year=dt[0], month=dt[1], day=dt[2],
hour=dt[3], minute=dt[4], second=dt[5],
microsecond=us, tzinfo=tz)
def format_rfc3339(date_time):
if date_time.tzinfo is None:
date_time = date_time.replace(tzinfo=UTC)
date_time = date_time.astimezone(UTC)
return date_time.strftime(‘%Y-%m-%dT%H:%M:%SZ’)
