/usr/lib/python3/dist-packages/skytools/timeutil.py is in python3-skytools 3.3-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | """Fill gaps in Python time API-s.
parse_iso_timestamp:
Parse reasonable subset of ISO_8601 timestamp formats.
[ http://en.wikipedia.org/wiki/ISO_8601 ]
datetime_to_timestamp:
Get POSIX timestamp from datetime() object.
"""
from __future__ import division, absolute_import, print_function
import re
import time
from datetime import datetime, timedelta, tzinfo
__all__ = ['parse_iso_timestamp', 'FixedOffsetTimezone', 'datetime_to_timestamp']
class FixedOffsetTimezone(tzinfo):
"""Fixed offset in minutes east from UTC."""
__slots__ = ('__offset', '__name')
def __init__(self, offset):
super(FixedOffsetTimezone, self).__init__()
self.__offset = timedelta(minutes=offset)
# numeric tz name
h, m = divmod(abs(offset), 60)
if offset < 0:
h = -h
if m:
self.__name = "%+03d:%02d" % (h, m)
else:
self.__name = "%+03d" % h
def utcoffset(self, dt):
return self.__offset
def tzname(self, dt):
return self.__name
def dst(self, dt):
return ZERO
ZERO = timedelta(0)
#
# Parse ISO_8601 timestamps.
#
"""
TODO:
- support more combinations from ISO 8601 (only reasonable ones)
- cache TZ objects
- make it faster?
"""
_iso_regex = r"""
\s*
(?P<year> \d\d\d\d) [-] (?P<month> \d\d) [-] (?P<day> \d\d) [ T]
(?P<hour> \d\d) [:] (?P<min> \d\d)
(?: [:] (?P<sec> \d\d ) (?: [.,] (?P<ss> \d+))? )?
(?: \s* (?P<tzsign> [-+]) (?P<tzhr> \d\d) (?: [:]? (?P<tzmin> \d\d))?
| (?P<tzname> Z ) )?
\s* $
"""
_iso_rc = None
def parse_iso_timestamp(s, default_tz=None):
"""Parse ISO timestamp to datetime object.
YYYY-MM-DD[ T]HH:MM[:SS[.ss]][-+HH[:MM]]
Assumes that second fractions are zero-trimmed from the end,
so '.15' means 150000 microseconds.
If the timezone offset is not present, use default_tz as tzinfo.
By default its None, meaning the datetime object will be without tz.
Only fixed offset timezones are supported.
>>> str(parse_iso_timestamp('2005-06-01 15:00'))
'2005-06-01 15:00:00'
>>> str(parse_iso_timestamp(' 2005-06-01T15:00 +02 '))
'2005-06-01 15:00:00+02:00'
>>> str(parse_iso_timestamp('2005-06-01 15:00:33+02:00'))
'2005-06-01 15:00:33+02:00'
>>> d = parse_iso_timestamp('2005-06-01 15:00:59.33 +02')
>>> d.strftime("%z %Z")
'+0200 +02'
>>> str(parse_iso_timestamp(str(d)))
'2005-06-01 15:00:59.330000+02:00'
>>> parse_iso_timestamp('2005-06-01 15:00-0530').strftime('%Y-%m-%d %H:%M %z %Z')
'2005-06-01 15:00 -0530 -05:30'
>>> parse_iso_timestamp('2014-10-27T11:59:13Z').strftime('%Y-%m-%d %H:%M:%S %z %Z')
'2014-10-27 11:59:13 +0000 +00'
>>> parse_iso_timestamp('2014.10.27')
Traceback (most recent call last):
...
ValueError: Date not in ISO format: '2014.10.27'
"""
global _iso_rc
if _iso_rc is None:
_iso_rc = re.compile(_iso_regex, re.X)
m = _iso_rc.match(s)
if not m:
raise ValueError('Date not in ISO format: %s' % repr(s))
tz = default_tz
if m.group('tzsign'):
tzofs = int(m.group('tzhr')) * 60
if m.group('tzmin'):
tzofs += int(m.group('tzmin'))
if m.group('tzsign') == '-':
tzofs = -tzofs
tz = FixedOffsetTimezone(tzofs)
elif m.group('tzname'):
tz = UTC
return datetime(int(m.group('year')),
int(m.group('month')),
int(m.group('day')),
int(m.group('hour')),
int(m.group('min')),
m.group('sec') and int(m.group('sec')) or 0,
m.group('ss') and int(m.group('ss').ljust(6, '0')) or 0,
tz)
#
# POSIX timestamp from datetime()
#
UTC = FixedOffsetTimezone(0)
TZ_EPOCH = datetime.fromtimestamp(0, UTC)
UTC_NOTZ_EPOCH = datetime.utcfromtimestamp(0)
def datetime_to_timestamp(dt, local_time=True):
"""Get posix timestamp from datetime() object.
if dt is without timezone, then local_time specifies
whether it's UTC or local time.
Returns seconds since epoch as float.
>>> datetime_to_timestamp(parse_iso_timestamp("2005-06-01 15:00:59.5 +02"))
1117630859.5
>>> datetime_to_timestamp(datetime.fromtimestamp(1117630859.5, UTC))
1117630859.5
>>> datetime_to_timestamp(datetime.fromtimestamp(1117630859.5))
1117630859.5
>>> now = datetime.utcnow()
>>> now2 = datetime.utcfromtimestamp(datetime_to_timestamp(now, False))
>>> abs(now2.microsecond - now.microsecond) < 100
True
>>> now2 = now2.replace(microsecond = now.microsecond)
>>> now == now2
True
>>> now = datetime.now()
>>> now2 = datetime.fromtimestamp(datetime_to_timestamp(now))
>>> abs(now2.microsecond - now.microsecond) < 100
True
>>> now2 = now2.replace(microsecond = now.microsecond)
>>> now == now2
True
"""
if dt.tzinfo:
delta = dt - TZ_EPOCH
return delta.total_seconds()
elif local_time:
s = time.mktime(dt.timetuple())
return s + (dt.microsecond / 1000000.0)
else:
delta = dt - UTC_NOTZ_EPOCH
return delta.total_seconds()
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