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import datetime
import re
rfc3339_re = re.compile(r'(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(\.\d+)?(?:Z|([+-]\d{2}):(\d{2}))')
def parse_rfc3339(v):
m = rfc3339_re.match(v)
if not m or m.group(0) != v:
return None
return parse_rfc3339_re(m)
def parse_rfc3339_re(m):
r = map(int, m.groups()[:6])
if m.group(7):
micro = float(m.group(7))
else:
micro = 0
if m.group(8):
g = int(m.group(8), 10) * 60 + int(m.group(9), 10)
tz = _TimeZone(datetime.timedelta(0, g * 60))
else:
tz = _TimeZone(datetime.timedelta(0, 0))
y, m, d, H, M, S = r
return datetime.datetime(y, m, d, H, M, S, int(micro * 1000000), tz)
def format_rfc3339(v):
offs = v.utcoffset()
offs = int(offs.total_seconds()) // 60 if offs is not None else 0
if offs == 0:
suffix = 'Z'
else:
if offs > 0:
suffix = '+'
else:
suffix = '-'
offs = -offs
suffix = '{0}{1:02}:{2:02}'.format(suffix, offs // 60, offs % 60)
if v.microsecond:
return v.strftime('%Y-%m-%dT%H:%M:%S.%f') + suffix
else:
return v.strftime('%Y-%m-%dT%H:%M:%S') + suffix
class _TimeZone(datetime.tzinfo):
def __init__(self, offset):
self._offset = offset
def utcoffset(self, dt):
return self._offset
def dst(self, dt):
return None
def tzname(self, dt):
m = self._offset.total_seconds() // 60
if m < 0:
res = '-'
m = -m
else:
res = '+'
h = m // 60
m = m - h * 60
return '{}{:.02}{:.02}'.format(res, h, m)