def main():
#
# UNIX command 'date'
#
if False:
pr("UNIX command 'date'")
cmd = 'date'
r = commands.getoutput(cmd)
pr("UNIX date command", r)
pr("r.split()[4]", r.split()[4])
#
# Python datetime
#
if False:
pr("Python datetime")
pr('datetime.datetime.now() ', datetime.datetime.now() )
t = datetime.datetime.now() - datetime.datetime.utcnow()
pr("datetime.now() - datetime.utcnow()", t)
pr("timedelta(-1, 68399, 999998) == timedelta(-1, 68400, 0)",
datetime.timedelta(-1, 68399, 999998) == datetime.timedelta(-1, 68400, 0)
)
pr("datetime.timedelta(hours=-5, seconds = -1) < t < datetime.timedelta(hours=-5, seconds = 1)",
datetime.timedelta(hours=-5, seconds = -1) < t < datetime.timedelta(hours=-5, seconds = 1))
# print datetime.timedelta(hours=-5, seconds = 0) < t < datetime.timedelta(hours=-5, seconds = 1) #False
# print datetime.timedelta(hours=-5, seconds = -1) < t < datetime.timedelta(hours=-5, seconds = 0) #True
t2 = datetime.datetime.utcnow() + t
pr('strftime("%a %Y.%m.%d %I:%M:%S")', t2.strftime("%a %Y.%m.%d %I:%M:%S") )
d3 = datetime.datetime(2011, 7, 29, 23, 46, 39)
pr( 'str(d3)', str(d3) )
prr("_DATETIME_to_python(d3)", _DATETIME_to_python(d3))
#
# Cocoa (Foundation) NSDate, NSCalendar, NSDateFormatter, etc.
#
pr("Cocoa (Foundation) NSDate, etc.")
date1 = NSDate.dateWithTimeIntervalSinceReferenceDate_(333675999.713839)
date2 = NSDate.dateWithTimeIntervalSinceReferenceDate_(333675999.713839 - 6 * 30 * 24 *60 * 60)
date3 = NSDate.distantPast() # dateWithTimeIntervalSinceNow_(0- 6 * 30 * 24 *60 * 60)
pr( "date1" , date1)
pr( "date2" , date2)
pr( "date3" , date3)
prr("_DATETIME_to_python(date1)", _DATETIME_to_python(date1))
# pr( "str(date1) ", str(date1) )
currentCalendar = NSCalendar.currentCalendar()
#
# time zones
#
def pr_tz(l, tz):
s = tz.secondsFromGMT() / (60 * 60)
print "%s:\n\n %r (%s) offset %d hours%s\n" % (l,tz.name(), tz.abbreviation(), s ,
" (**local**)" if "Local Time Zone " in tz.description() else "")
# print tz.description()
# timeZone_Current = currentCalendar.timeZone()
#
# pr_tz('timeZone_Local', timeZone_Local)
#
# # s = timeZone_GMT.secondsFromGMT() / (60 * 60)
# # pr("timeZone_GMT", str(timeZone_GMT) + " offset: %d hours" % s )
# pr( "timeZone_Local.isDaylightSavingTime()", timeZone_Local.isDaylightSavingTime() ) # determines whether daylight saving time is currently in effect.
# pr( "timeZone_Local.daylightSavingTimeOffset()", timeZone_Local.daylightSavingTimeOffset() ) # determines the current daylight saving time offset. For most time zones this is either zero or one.
# pr( "timeZone_Local.nextDaylightSavingTimeTransition()", timeZone_Local.nextDaylightSavingTimeTransition())
# Formatting for Machines: Controlled Environment Needed
#
# It is a whole other matter if you need to create a date string according to
# the specification of a certain file format or API.
# In such a case, you usually have to follow a very strict spec to
# make sure the other party can read the string you are generating.
# By default, NSDateFormatter uses the user’s current calendar and time zone,
# which are possibly different from the requirements.
# Most file formats and web APIs use the western, Gregorian calendar,
# so we need to make sure that our date formatter uses it, too.
dateFormatter_Local = NSDateFormatter.alloc().init()
dateFormatter_Current = NSDateFormatter.alloc().init()
dateFormatter_GMT = NSDateFormatter.alloc().init()
dateFormatter_GMT5 = NSDateFormatter.alloc().init()
dateFormatter_NY = NSDateFormatter.alloc().init()
# dateFormatter_Local.__name__ = 'dateFormatter_Local'
formatter_names = [ ]
time_zones = [
('Local' , NSTimeZone.localTimeZone()) ,
('Current' , currentCalendar.timeZone()) ,
('GMT' , NSTimeZone.timeZoneForSecondsFromGMT_(0)) ,
('GMT5' , NSTimeZone.timeZoneForSecondsFromGMT_(-18000)) ,
('NY' , NSTimeZone.timeZoneWithName_(u'America/New_York')) ,
('System', NSTimeZone. systemTimeZone() ) ,
('G' , NSTimeZone.timeZoneWithAbbreviation_(u'GMT'))
]
dx = [ {'name' : n , 'tz' : tz, 'df' : NSDateFormatter.alloc().init() } for n, tz in time_zones ]
s = [ "%12s: %s" % (x['name'], "%r (%s) %s%s" % tz_pr(x['tz']) ) for x in dx ]
print "\n".join(s)
print
def eq_classes(dx, k):
# z = []
d = {}
for n, x in enumerate(dx):
if x[k] not in d:
d[x[k]] = set([ x['name'] ])
for m in range(n):
y = dx[m]
if x != y and x[k] == y[k]:
# z.append((x['name'], y['name']))
if x[k] in d:
d[x[k]].add( x['name'] )
# else:
# d[x[k]] = set([ x['name'] ])
if y[k] in d:
d[y[k]].add( y['name'] )
# else:
# d[y[k]] = [ y['name'] ]
return d
print "eq_classes of dx (under tz):"
print
eq_classes_dx = eq_classes(dx, 'tz')
print "\n".join([ "%20s: %s" % (x.name(), list(eq_classes_dx[x])) for x in eq_classes_dx])
print
eq_names = [ list(eq_classes_dx[x])[0] for x in eq_classes_dx ]
dx = [ z for z in dx if z['name'] in eq_names ]
s = [ "%12s: %s" % (x['name'], "%r (%s) %s%s" % tz_pr(x['tz']) ) for x in dx ]
print "\n".join(s)
print
# print "\n".join([ "%20s: %r" % [k for k in x] for x in dx ])
# format string (formatter)
# format_string = "E yyyy'-'MM'-'dd' 'HH':'mm':'ss VVVV" # ==> "AD 2011-07-29 19:46:39 United States (New York)"
# format_string = "E yyyy'-'MM'-'dd' 'HH':'mm':'ss VVV" # ==> " 'Fri 2011-07-29 19:46:39 GMT-04:00'
format_string = "E yyyy'-'MM'-'dd' 'HH':'mm':'ss z" # ==> 'Fri 2011-07-29 19:46:39 EDT') or 'EST', or 'GMT-04:00'
map ( lambda y : NSDateFormatter.setDateFormat_(y, format_string) , [x['df'] for x in dx] )
# locale
locale = NSLocale.alloc().initWithLocaleIdentifier_("en_US_POSIX")
pr("NSDate.date()", NSDate.date())
map ( lambda y : NSDateFormatter.setLocale_(y, locale) , [x['df'] for x in dx] )
map ( lambda y : NSDateFormatter.setTimeZone_(y[0], y[1]) , [ (x['df'], x['tz']) for x in dx] )
pr('descriptionWithCalendarFormat:timeZone:locale',
date1.descriptionWithCalendarFormat_timeZone_locale_( None, None, locale) )
# format_string,NSTimeZone.timeZoneForSecondsFromGMT_(-18000),locale
pr('descriptionWithCalendarFormat:timeZone:locale',
date1.descriptionWithCalendarFormat_timeZone_locale_( None, NSTimeZone.timeZoneForSecondsFromGMT_(-18000), locale) )
# format_string,NSTimeZone.timeZoneForSecondsFromGMT_(-18000),locale
for a in [date1, date2, date3]:
dsd = get_datestrings(dx, a)
s = [ "%12s: %r" % (x[0], x[1] ) for x in dsd ]
print "\n".join(s)
print
#
# date1_components
#
fcdc = currentCalendar.components_fromDate_(
NSYearCalendarUnit |
NSMonthCalendarUnit |
NSDayCalendarUnit |
NSHourCalendarUnit |
NSMinuteCalendarUnit |
NSSecondCalendarUnit ,
date1
)
pr( "currentCalendar.components_fromDate",
[ fcdc.year(), fcdc.month(), fcdc.day(), fcdc.hour(), fcdc.minute(), fcdc.second(), ]
)
dateOfKeynote = currentCalendar.dateFromComponents_(fcdc)
pr( "currentCalendar.dateFromComponents", dateOfKeynote )
"""prints repr() of v"""
if v is not None:
print "%s:\n\n %r\n" % (l, v)
else:
print "%s\n%s\n" % (l, "_"*len(l))
def tz_pr(tz):
return (
tz.name(),
tz.abbreviation(),
"offset %d hours" % (tz.secondsFromGMT() / (60 * 60) ),
"(**local**)" if "Local Time Zone " in tz.description() else ""
)
currentCalendar = NSCalendar.currentCalendar()
def get_datestrings(dx, date1):
return map ( lambda y : (y[0], NSDateFormatter.stringFromDate_(y[1], date1)) , [ (x['name'] , x['df']) for x in dx] )
def _DATETIME_to_python( in_date ):
"""
Returns DATETIME column type as datetime.datetime type.
"""
# pv = None
# try:
v = str(in_date)
a = v.split(" ")
fs = 0