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# -*- coding: utf-8 -*-
import datetime
import math
import re
DTM_TZ_RE = re.compile(r"(\d+(?:\.\d+)?)(?:([+-]\d{2})(\d{2}))?")
class _UTCOffset(datetime.tzinfo):
"""Fixed offset timezone from UTC."""
def __init__(self, minutes):
"""``minutes`` is a offset from UTC, negative for west of UTC"""
self.minutes = minutes
def utcoffset(self, dt):
return datetime.timedelta(minutes=self.minutes)
def tzname(self, dt):
minutes = abs(self.minutes)
return "{0}{1:02}{2:02}".format(
"-" if self.minutes < 0 else "+", minutes // 60, minutes % 60
)
def dst(self, dt):
return datetime.timedelta(0)
def parse_datetime(value):
"""Parse hl7 DTM string ``value`` :py:class:`datetime.datetime`.
``value`` is of the format YYYY[MM[DD[HH[MM[SS[.S[S[S[S]]]]]]]]][+/-HHMM]
or a ValueError will be raised.
:rtype: :py:;class:`datetime.datetime`
"""
if not value:
return None
# Split off optional timezone
dt_match = DTM_TZ_RE.match(value)
if not dt_match:
raise ValueError("Malformed HL7 datetime {0}".format(value))
dtm = dt_match.group(1)
tzh = dt_match.group(2)
tzm = dt_match.group(3)
if tzh and tzm:
minutes = int(tzh) * 60
minutes += math.copysign(int(tzm), minutes)
tzinfo = _UTCOffset(minutes)
else:
tzinfo = None
precision = len(dtm)
if precision >= 4:
year = int(dtm[0:4])
else:
raise ValueError("Malformed HL7 datetime {0}".format(value))
if precision >= 6:
month = int(dtm[4:6])
else:
month = 1
if precision >= 8:
day = int(dtm[6:8])
else:
day = 1
if precision >= 10:
hour = int(dtm[8:10])
else:
hour = 0
if precision >= 12:
minute = int(dtm[10:12])
else:
minute = 0
if precision >= 14:
delta = datetime.timedelta(seconds=float(dtm[12:]))
second = delta.seconds
microsecond = delta.microseconds
else:
second = 0
microsecond = 0
return datetime.datetime(
year, month, day, hour, minute, second, microsecond, tzinfo=tzinfo
)
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