python中常用日期操作总结

sunyke

# -*- coding: utf-8 -*-
from datetime import datetime
from datetime import date
from time import strftime
from time import strptime
from datetime import timedelta
def getCurDate():
"""Return value of the date"""
return date(datetime.now().year,datetime.now().month,datetime.now().day)
def getCurTime():
"""Return value of the datetime"""
return datetime.now()
def converDateTimeToStr(cdate,format='%Y-%m-%d %H:%M:%S'):
"""
Convert datetime to String
cdata parameter must be the datetime or date of
Return value of the date string format(%Y-%m-%d)
"""
sdate = None
try:
sdate = cdate.strftime(format)
except:
raise ValueError
return sdate
def converDateToDateTime(fdate):
"""
Convert date to datetime
fdate parameter must be the date of
Return value of the datetime
"""
return datetime(fdate.year,fdate.month,fdate.day,0,0,0)
def converDateTimeToDate(fdate):
"""
Convert datetime to date
fdate parameter must be the datetime of
Return value of the date
"""
return date(fdate.year,fdate.month,fdate.day)
def converStrToDate(cstr):
"""
Convert str to date
cstr parameter must be the str of
Return value of the date
"""
fdate = None
try:
fdate = date(*strptime(cstr, '%Y-%m-%d')[0:3])
except:
raise ValueError
return fdate
def converStrToDateTime(cstr):
"""
Convert str to datetime
cstr parameter must be the str of
Return value of the datetime
"""
fdate = None
try:
fdate = datetime(*strptime(cstr,'%Y-%m-%d %H:%M:%S')[0:6])
except:
raise ValueError
return fdate
def getTheMonthDays(year,month):
"""the number of days a month"""
if month + 1 > 12:
month = 1
year = year + 1
else:
month = month +1
return (datetime(year,month,1) + timedelta(days=-1)).day
"""
#1.获得当前日期
curdate = getCurDate()
print '当前日期 :%s'%(curdate)
#2.获得当前时间
curtime = getCurTime()
print '当前时间  :%s'%(curtime)
#3.将当前日期转换为字符串
print '当前日期 :%s'%(converDateTimeToStr(curdate,'%Y-%m-%d'))
#4.将当前时间转换为字符串
print '当前时间:%s'%(converDateTimeToStr(curtime))
#5.将当前日期转换为时间
print '当前时间:%s' % (converDateToDateTime(curdate))
#6.将当前时间转换为日期
print '当前日期:%s' % (converDateTimeToDate(curtime))
#7.将字符串转换为日期
print '日期:%s' % (converStrToDate('2009-04-30'))
#8.将字符串转换为时间
print '时间:%s' % (converStrToDateTime('2009-04-30 23:59:59'))
#9.获得本月有多少天
print getTheMonthDays(curdate.year,curdate.month)
"""