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""" Python part of the low-level DateTime[Delta] type implementation.
(c) 1998, Copyright Marc-Andre Lemburg; All Rights Reserved.
See the documentation for further information on copyrights,
or contact the author (mal@lemburg.com).
"""
# Import C extension module
from mxDateTime import *
from mxDateTime import __version__
# Singletons
oneSecond = DateTimeDelta(0,0,0,1)
oneMinute = DateTimeDelta(0,0,1)
oneHour = DateTimeDelta(0,1)
oneDay = DateTimeDelta(1)
oneWeek = DateTimeDelta(7)
Epoch = DateTimeFromAbsDateTime(1,0)
# Shortcuts for pickle (reduces the pickle's length)
def _DT(absdate,abstime):
return DateTimeFromAbsDateTime(absdate,abstime)
def _DTD(seconds):
return DateTimeDeltaFromSeconds(seconds)
# Module init
class modinit:
global _time,_string
import time,string
_time = time
_string = string
### Register the two types
import copy_reg
def pickle_DateTime(d):
return _DT,(d.absdate,d.abstime)
def pickle_DateTimeDelta(d):
return _DTD,(d.seconds,)
copy_reg.pickle(DateTimeType,
pickle_DateTime,
_DT)
copy_reg.pickle(DateTimeDeltaType,
pickle_DateTimeDelta,
_DTD)
del modinit
# Aliases and functions to make 'from DateTime import *' work much
# like 'from time import *'
def localtime(ticks=None,
# Locals:
time=_time.time,float=float,localtime=_time.localtime,
round=round,int=int,DateTime=DateTime):
"""localtime(ticks=None)
Construct a DateTime instance using local time from ticks.
If ticks are not given, it defaults to the current time.
The result is similar to time.localtime(). Fractions of a
second are rounded to the nearest micro-second."""
if ticks is None:
ticks = time()
else:
ticks = float(ticks)
Y,M,D,h,m,s = localtime(ticks)[:6]
s = round(s + (ticks - int(ticks)),6)
return DateTime(Y,M,D,h,m,s)
def gmtime(ticks=None,
# Locals:
time=_time.time,float=float,gmtime=_time.gmtime,
round=round,int=int,DateTime=DateTime):
"""gmtime(ticks=None)
Construct a DateTime instance using UTC time from ticks.
If ticks are not given, it defaults to the current time.
The result is similar to time.gmtime(). Fractions of a
second are rounded to the nearest micro-second."""
if ticks is None:
ticks = time()
else:
ticks = float(ticks)
Y,M,D,h,m,s = gmtime(ticks)[:6]
s = round(s + (ticks - int(ticks)),6)
return DateTime(Y,M,D,h,m,s)
def mktime(year,month,day,hour,minute,second,dow,doy,dst,
# Locals:
DateTime=DateTime):
"""mktime(year,month,day,hour,minute,second,dow,doy,dst)
Alias for DateTime that excepts additional arguments to be
call compatible with time.mktime(). Note that the arguments dow,doy
and dst are not used in any way."""
return DateTime(year,month,day,hour,minute,second)
def ctime(datetime):
"""ctime(datetime)
Returns a string representation of the given DateTime instance
using the current locale's default settings."""
return datetime.strftime('%c')
def today(hour=0,minute=0,second=0.0,
# Locals:
localtime=_time.localtime,time=_time.time,DateTime=DateTime):
"""today(hour=0,minute=0,second=0.0)
Returns a DateTime instance for today (in local time) at the
given time (defaults to midnight)."""
Y,M,D = localtime(time())[:3]
return DateTime(Y,M,D,hour,minute,second)
def TimeDelta(hours=0.0,minutes=0.0,seconds=0.0,
# Locals:
DateTimeDelta=DateTimeDelta):
"""TimeDelta(hours=0.0,minutes=0.0,seconds=0.0)
Returns a DateTimeDelta-object reflecting the given
time delta. Seconds can be given as float to indicate fractions."""
return DateTimeDelta(0,hours,minutes,seconds)
# Choose the implementation for gmticks()... the timegm() C API
# is preferred over the mktime() approach (which may fail on some
# platforms).
if hasattr(Epoch,'gmticks'):
def gmticks(datetime):
"""gmticks(datetime)
Returns a ticks value based on the values stored in
datetime under the assumption that they are given
in UTC, rather than local time."""
return datetime.gmticks()
def tz_offset(datetime,
# Locals:
oneSecond=oneSecond):
"""tz_offset(datetime)
Returns a DateTimeDelta instance representing the UTC offset
for datetime assuming that the stored values refer to local
time. If you subtract this value from datetime, you'll get UTC
time."""
return (datetime.gmticks() - datetime.ticks())*oneSecond
# Note: The method used for calculating the tz offset may fail
# near the DST switching time. I haven't put much thought into
# this yet, but some experiments show that it continues to
# work even during the switching periods. This is, of course, no proof.
else:
def gmticks(datetime):
"""gmticks(datetime)
Returns a ticks value based on the values stored in
datetime under the assumption that they are given
in UTC, rather than local time."""
try:
return datetime.ticks(_time.timezone,0)
except SystemError:
raise SystemError,'gmticks() is not supported on this platform'
def tz_offset(datetime,
# Locals:
oneSecond=oneSecond):
"""tz_offset(datetime)
Returns a DateTimeDelta instance representing the UTC offset
for datetime assuming that the stored values refer to local
time. If you subtract this value from datetime, you'll get UTC
time."""
local = datetime.ticks()
try:
gmt = datetime.ticks(_time.timezone,0)
except SystemError:
raise SystemError,'tz_offset() is not supported on this platform'
return (gmt - local)*oneSecond
def gm2local(datetime):
""" Convert a DateTime instance holding UTC time to a DateTime
instance using local time.
"""
return localtime(gmticks(datetime))
def local2gm(datetime):
""" Convert a DateTime instance holding local time to a DateTime
instance using UTC time.
"""
return gmtime(datetime.ticks())
###
class RelativeDateTime:
"""RelativeDateTime(years=0,months=0,days=0,year=0,month=0,day=0,
hours=0,minutes=0,seconds=0,
hour=None,minute=None,second=None)
Returns a RelativeDateTime instance for the specified relative
time. The constructor handles keywords, so you'll only have to
give those parameters which should be changed when you add the
relative to an absolute DateTime instance. Absolute values passed
to the constructor will override delta values of the same type.
Adding RelativeDateTime instances is supported with the
following rules: deltas will be added together, right side
absolute values override left side ones.
Adding RelativeDateTime instances to DateTime instances will
return DateTime instances with the appropriate calculations
applied, e.g. to get a DateTime instance for the first of next
month, you'd call now()+RelativeDateTime(months=+1,day=01).
"""
years = 0
months = 0
days = 0
year = 0
month = 0
day = 0
hours = 0
minutes = 0
seconds = 0
hour = None
minute = None
second = None
def __init__(self,years=0,months=0,days=0,year=0,month=0,day=0,
hours=0,minutes=0,seconds=0,
hour=None,minute=None,second=None):
self.years = years
self.months = months
self.days = days
self.year = year
self.month = month
self.day = day
self.hours = hours
self.minutes = minutes
self.seconds = seconds
self.hour = hour
self.minute = minute
self.second = second
def __add__(self,other):
if isinstance(other,RelativeDateTime):
# RelativeDateTime (self) + RelativeDateTime (other)
r = RelativeDateTime()
# date deltas
r.years = self.years + other.years
r.months = self.months + other.months
r.days = self.days + other.days
# absolute entries of other override those in self, if given
r.year = other.year or self.year
r.month = other.month or self.month
r.day = other.day or self.day
# time deltas
r.hours = self.hours + other.hours
r.minutes = self.minutes + other.minutes
r.seconds = self.seconds + other.seconds
# absolute entries of other override those in self, if given
r.hour = other.hour or self.hour
r.minute = other.minute or self.minute
r.second = other.second or self.second
return r
else:
raise TypeError,"can't add the two types"
def __radd__(self,other,
# Locals:
None=None,isinstance=isinstance,DateTime=DateTime):
if isinstance(other,DateTimeType):
# DateTime (other) + RelativeDateTime (self)
# date
year = self.year or (other.year + self.years)
month = self.month or (other.month + self.months)
day = self.day or (other.day + self.days)
# time
hour = self.hour
if hour is None:
hour = other.hour + self.hours
minute = self.minute
if minute is None:
minute = other.minute + self.minutes
second = self.second
if second is None:
second = other.second + self.seconds
#print 'first try:',year, month, day, hour, minute, second
if month > 0 and day > 0:
try:
return DateTime(year, month, day, hour, minute, second)
except RangeError:
pass
# Refit into proper ranges:
if month < 1 or month > 12:
month = month - 1
year = year + month / 12
month = month % 12 + 1
#print 'second try:',year, month, day, hour, minute, second
return DateTime(year, month, 1) + \
DateTimeDelta(day-1,hour,minute,second)
else:
raise TypeError,"can't add the two types"
def __sub__(self,other):
if isinstance(other,RelativeDateTime):
# RelativeDateTime (self) - RelativeDateTime (other)
r = RelativeDateTime()
# date deltas
r.years = self.years - other.years
r.months = self.months - other.months
r.days = self.days - other.days
# absolute entries of other override those in self, if given
r.year = other.year or self.year
r.month = other.month or self.month
r.day = other.day or self.day
# time deltas
r.hours = self.hours - other.hours
r.minutes = self.minutes - other.minutes
r.seconds = self.seconds - other.seconds
# absolute entries of other override those in self, if given
r.hour = other.hour or self.hour
r.minute = other.minute or self.minute
r.second = other.second or self.second
return r
else:
raise TypeError,"can't subtract the two types"
def __rsub__(self,other,
# Locals:
None=None,isinstance=isinstance,DateTime=DateTime):
if isinstance(other,DateTimeType):
# DateTime (other) - RelativeDateTime (self)
# date
year = self.year or (other.year - self.years)
month = self.month or (other.month - self.months)
day = self.day or (other.day - self.days)
# time
hour = self.hour
if hour is None:
hour = other.hour - self.hours
minute = self.minute
if minute is None:
minute = other.minute - self.minutes
second = self.second
if second is None:
second = other.second - self.seconds
#print 'first try:',year, month, day, hour, minute, second
if month > 0 and day > 0:
try:
return DateTime(year, month, day, hour, minute, second)
except RangeError:
pass
# Refit into proper ranges:
if month < 1 or month > 12:
month = month - 1
year = year + month / 12
month = month % 12 + 1
#print 'second try:',year, month, day, hour, minute, second
return DateTime(year, month, 1) + \
DateTimeDelta(day-1,hour,minute,second)
else:
raise TypeError,"can't subtract the two types"
def __str__(self,
join=_string.join):
l = []
append = l.append
if self.year:
append('%04i-' % self.year)
elif self.years:
append('(%0+5i)-' % self.years)
else:
append('YYYY-')
if self.month:
append('%02i-' % self.month)
elif self.months:
append('(%0+3i)-' % self.months)
else:
append('MM-')
if self.day:
append('%02i ' % self.day)
elif self.days:
append('(%0+3i) ' % self.days)
else:
append('DD ')
append(' ')
if self.hour is not None:
append('%02i:' % self.hour)
elif self.hours:
append('(%0+3i):' % self.hours)
else:
append('HH:')
if self.minute is not None:
append('%02i:' % self.minute)
elif self.minutes:
append('(%0+3i):' % self.minutes)
else:
append('MM:')
if self.second is not None:
append('%02i' % self.second)
elif self.seconds:
append('(%0+3i)' % self.seconds)
else:
append('SS')
return join(l,'')
# Aliases
utctime = gmtime
utcticks = gmticks
utc2local = gm2local
local2utc = local2gm
DateTimeFromTicks = localtime
now = localtime
Date = DateTime
Time = TimeDelta
Timestamp = DateTime
RelativeDate = RelativeDateTime
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