python教程 python日期函式例項

在python中對日期進行操作的庫有：datetime、time

無論在哪種語言，日期函式肯定是最常用的函式。下面直接上例項程式碼

#datetime
import datetime
#當前日期
now = datetime.datetime.now()
print(now.strftime('%Y-%m-%d %H:%M:%S'))
print(now.strftime('%Y-%m-%d'))
#string convert to datetime
time_str = '2013-07-29 09:05:00'
str_convert_2_time = datetime.datetime.strptime(time_str, '%Y-%m-%d %H:%M:%S')
print(str_convert_2_time)
#比較兩個日期相差多少天
time_strA = '2013-07-29 09:05:00'
time_strB ='2013-08-29 09:05:00'
day = datetime.datetime.strptime(time_strA, '%Y-%m-%d %H:%M:%S')
day2 = datetime.datetime.strptime(time_strB, '%Y-%m-%d %H:%M:%S')
sub_day = day2 - day
print('{0}和{1}相差{2}天'.format(time_strA, time_strB, str(sub_day.days)))
#今後的n天的日期
n_days = 4
now = datetime.datetime.now()
my_date = datetime.timedelta(days=n_days)  
n_day = now + my_date
print('從今天起的{0}天的日期是：'.format(n_days))
print(n_day.strftime('%Y-%m-%d %H:%M:%S'))

執行結果：

>>>

2013-07-29 09:48:16

2013-07-29

2013-07-29 09:05:00

2013-07-29 09:05:00和2013-08-29 09:05:00相差31天

從今天起的4天的日期是：

2013-08-02 09:48:16

>>>