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'''
Task Coach - Your friendly task manager
Copyright (C) 2004-2014 Task Coach developers <developers@taskcoach.org>
Task Coach is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Task Coach is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import datetime, timedelta, re, time
from .date import Date
from .fix import StrftimeFix
class DateTime(StrftimeFix, datetime.datetime):
secondsPerMinute = 60
minutesPerHour = 60
hoursPerDay = 24
secondsPerHour = minutesPerHour * secondsPerMinute
secondsPerDay = hoursPerDay * secondsPerHour
def __new__(class_, *args, **kwargs):
if not args and not kwargs:
max = datetime.datetime.max # pylint: disable=W0622
args = (max.year, max.month, max.day,
max.hour, max.minute, max.second, max.microsecond)
return datetime.datetime.__new__(class_, *args, **kwargs)
@staticmethod
def fromDateTime(dateTime):
return DateTime(year=dateTime.year, month=dateTime.month, day=dateTime.day,
hour=dateTime.hour, minute=dateTime.minute, second=dateTime.second,
microsecond=dateTime.microsecond)
def date(self):
return Date(self.year, self.month, self.day)
def weeknumber(self):
return self.isocalendar()[1]
def weekday(self):
return self.isoweekday() # Sunday = 7, Monday = 1, etc.
def toordinal(self):
''' Return the ordinal number of the day, plus a fraction between 0 and
1 for parts of the day. '''
ordinal = super(DateTime, self).toordinal()
seconds = self.hour * self.secondsPerHour + \
self.minute * self.secondsPerMinute + \
self.second
return ordinal + (seconds / float(self.secondsPerDay))
def startOfDay(self):
return self.replace(hour=0, minute=0, second=0, microsecond=0)
def endOfDay(self):
return self.replace(hour=23, minute=59, second=59, microsecond=999999)
def startOfWeek(self):
days = self.weekday()
monday = self - timedelta.TimeDelta(days=days-1)
return DateTime(monday.year, monday.month, monday.day)
def endOfWeek(self):
days = self.weekday()
sunday = self + timedelta.TimeDelta(days=7-days)
return DateTime(sunday.year, sunday.month, sunday.day).endOfDay()
def startOfWorkWeek(self):
days = self.weekday()
monday = self - timedelta.TimeDelta(days=days-1)
return DateTime(monday.year, monday.month, monday.day)
def endOfWorkWeek(self):
days = 5 - self.weekday()
if days < 0:
days += 7
friday = self + timedelta.TimeDelta(days=days)
return DateTime(friday.year, friday.month, friday.day).endOfDay()
def startOfMonth(self):
return DateTime(self.year, self.month, 1)
def endOfMonth(self):
for lastday in [31,30,29,28]:
try:
return DateTime(self.year, self.month, lastday).endOfDay()
except ValueError:
pass
def startOfYear(self):
return DateTime(self.year, 1, 1).startOfDay()
def endOfYear(self):
return DateTime(self.year, 12, 31).endOfDay()
def __sub__(self, other):
''' Make sure substraction returns instances of the right classes. '''
if self == DateTime() and isinstance(other, datetime.datetime):
max = timedelta.TimeDelta.max # pylint: disable=W0622
return timedelta.TimeDelta(max.days, max.seconds, max.microseconds)
result = super(DateTime, self).__sub__(other)
if isinstance(result, datetime.timedelta):
result = timedelta.TimeDelta(result.days, result.seconds,
result.microseconds)
elif isinstance(result, datetime.datetime):
result = self.__class__(result.year, result.month, result.day,
result.hour, result.minute, result.second,
result.microsecond)
return result
def __add__(self, other):
result = super(DateTime, self).__add__(other)
return self.__class__(result.year, result.month, result.day,
result.hour, result.minute, result.second, result.microsecond)
DateTime.max = DateTime(datetime.datetime.max.year, 12, 31).endOfDay()
DateTime.min = DateTime(datetime.datetime.min.year, 1, 1).startOfDay()
def parseDateTime(string, *timeDefaults):
if string in ('', 'None'):
return None
else:
args = [int(arg) for arg in re.split('[-:. ]', string)]
if len(args) == 3: # We parsed a date, no time
args.extend(timeDefaults)
return DateTime(*args) # pylint: disable=W0142
def Now():
return DateTime.now()
def Today():
# For backwards compatibility: "Today()" may be used in templates
return Now().replace(hour=0, minute=0, second=0, microsecond=0)
def Tomorrow():
return Now() + timedelta.ONE_DAY
def Yesterday():
return Now() - timedelta.ONE_DAY
def LastDayOfCurrentMonth(localtime=time.localtime):
now = localtime()
year, nextMonth = now[0], now[1]+1
if nextMonth > 12:
nextMonth = 1
year += 1
return DateTime(year, nextMonth, 1) - timedelta.ONE_DAY
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