python类库31[时间和日期]

一 时间日期差

print("-----------------------------------")
# class datetime.timedelta(days=0, seconds=0, microseconds=0, milliseconds=0, minutes=0, hours=0, weeks=0)
oneyear  =  datetime.timedelta(days = 365 )
fivehours  =  datetime.timedelta(hours  = 2 )
tenminutes  =  datetime.timedelta(minutes  =   10 )
all  =  oneyear  +  fivehours  +  tenminutes
print (all)
# 365 days, 2:10:00

 

二 日期

print("-----------------------------------")
# datetime.date(year, month, day)
today  =  datetime.date.today()
print (today)
# 2011-01-15
print (today.year)
# 2011
print (today.month)
# 1
print (today.day)
# 15
print (today.weekday())
# 5 # Monday is 0 and Sunday is 6
print (today.isoweekday())
# 6 #  Monday is 1 and Sunday is 7
print (today.toordinal())
# 734152 #the days from 0001.01.01
tomorrow  =  today.fromordinal(today.toordinal()  +   1 )
print (tomorrow)
# 2011-01-16
print (today.isoformat())
# 2011-01-15
print (today.timetuple()[0])
# 2011
print (today.timetuple()[ 1 ])
# 1
print (today.timetuple()[ 2 ])
# 15

aftertenyears = today.replace(year = 2021)
print(aftertenyears)
#2021-01-15

date1  =  datetime.date( 2010 , 10 , 10 )
date2  =  datetime.date( 2010 , 9 , 20 )
diff  =  date1  -  date2  #  Diff is datetime.timedelta type
print (diff)
# 20 days, 0:00:00
if  date1  >  date2 :
  print ( " date1 > date2 " )
# date1 > date2

 

三 时间

print("-----------------------------------")
# datetime.time(hour=0, minute=0, second=0, microsecond=0, tzinfo=None)
time1  =  datetime.time( 13 , 30 , 20 )
print (time1)
# 13:30:20
print (time1.hour)
# 13
print (time1.minute)
# 30
print (time1.second)
# 20
print (time1.microsecond)
# 0
print (time1.isoformat())
# 13:30:20
time2  =  time1.replace(second  =   30 )
print (time2)
# 13:30:30

 

 

四 时间和日期

print ( " ----------------------------------- " )
# class datetime.datetime(year, month, day, hour=0, minute=0, second=0, microsecond=0, tzinfo=None) 
print (datetime.datetime.today())
# 2011-01-15 14:03:29.495000
print (datetime.datetime.utcnow())
# 2011-01-15 06:03:29.495000

# 2011-01-15 14:03:29.495000
cdatetime  =  datetime.datetime.now()
print (cdatetime)
# 2011-01-15 14:03:29.495000
print (cdatetime.year)
# 2011
print (cdatetime.month)
# 1
print (cdatetime.day)
# 15
print (cdatetime.hour)
# 14
print (cdatetime.minute)
# 03
print (cdatetime.second)
# 29
print (cdatetime.microsecond)
# 495000
print (cdatetime.date())
# 2011-01-15
print (cdatetime.time())
# 14:03:29.495000
print (cdatetime.weekday())
# 5 Monday is 0 and Sunday is 6
print (cdatetime.isoweekday())
# 6 Monday is 1 and Sunday is 7
print (cdatetime.isoformat())
# 2011-01-15T14:03:29.495000
print (cdatetime.isocalendar())
# (2011, 2, 6)

dt  =  cdatetime.strftime( " %d %b %Y %I:%M:%S %p " ) 
print (dt)
# 15 Jan 2011 02:03:29 PM

dt2  =  datetime.datetime.strptime( ' 17 Feb 2009 04:22:11 PM ' , ' %d %b %Y %I:%M:%S %p ' ) 
print (dt2)
# 2009-02-17 16:22:11

k  =   ( 2009 ,  3 ,  17 ,  16 ,  22 ,  11 )
dt3  =  datetime.datetime( * k[0: 6 ])
print (dt3)
# 2009-03-17 16:22:11

dt4  =  dt3.combine(datetime.date.today(),datetime.time( 1 , 10 , 30 ))
print (dt4)
# 2011-01-15 01:10:30

dt5  =  dt3.replace(year  =   2015 )
print (dt5)
# 2015-03-17 16:22:11

dt6  =  dt3.fromordinal(dt3.toordinal()  +   365 )
print (dt6)
# 2010-03-17 00:00:00

cdatetime  =  datetime.datetime.now()
print (cdatetime)
# 2011-01-15 14:03:29.518000
fivedaysago  =  cdatetime  - datetime.timedelta(days = 5 )
print (fivedaysago)
# 2011-01-15 14:03:29.518000
after5hours  =  cdatetime  +  datetime.timedelta(hours  =   5 )
print (after5hours)
# 2011-01-15 14:03:29.518000

 

五 date, datetime, and time 的strftime()

dt  =  datetime.datetime.now()
print (dt.strftime( " date: %B %d %Y  %A; time: %H:%M:%S ; other: day-%j week-%W " ))

#date: January 15 2011  Saturday; time: 15:01:18 ; other: day-015 week-02
print (dt.strftime( " %c " ))
# 01/15/11 15:01:18
print (dt.strftime( " %X %x " ))
# 15:01:18 01/15/11

 

所有的格式字符串：

 

完！