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# -*- coding: utf-8 -*-
__author__ = """Nicolas Aimetti"""
__email__ = 'naimetti@yahoo.com.ar'
__version__ = '0.1.4'
import re
import calendar
import six
RFC3339_REGEX_FLAGS = 0
if six.PY3:
RFC3339_REGEX_FLAGS |= re.ASCII
RFC3339_REGEX = re.compile(r"""
^
(\d{4}) # Year
-
(0[1-9]|1[0-2]) # Month
-
(\d{2}) # Day
T
(?:[01]\d|2[0123]) # Hours
:
(?:[0-5]\d) # Minutes
:
(?:[0-5]\d) # Seconds
(?:\.\d+)? # Secfrac
(?: Z # UTC
| [+-](?:[01]\d|2[0123]):[0-5]\d # Offset
)
$
""", re.VERBOSE | RFC3339_REGEX_FLAGS)
def validate_rfc3339(date_string):
"""
Validates dates against RFC3339 datetime format
Leap seconds are no supported.
"""
m = RFC3339_REGEX.match(date_string)
if m is None:
return False
year, month, day = map(int, m.groups())
if not year:
# Year 0 is not valid a valid date
return False
(_, max_day) = calendar.monthrange(year, month)
if not 1 <= day <= max_day:
return False
return True
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