Python标准库系列之datetime模块

Fast implementation of the datetime type.

功能 说明
datetime.date.today() 打印输出当前的系统日期
datetime.date.fromtimestamp(time.time()) 将时间戳转成日期格式
datetime.datetime.now() 打印当前的系统时间
current_time.replace(2016,5,12) 返回当前时间,但指定的值将被替换
datetime.datetime.strptime(“21/11/06 16:30”, “%d/%m/%y %H:%M”) 将字符串转换成日期格式

输出当前系统时间

>>> print(datetime.date.today())
2016-05-25

将时间戳格式转换为日期格式

>>> time.time()
# 时间戳格式
1464156222.1887317
>>> print(datetime.date.fromtimestamp(time.time()))
# 日期格式
2016-05-25

将日期格式转换为struct_time格式

>>> current_time = datetime.datetime.now()
>>> print(current_time)
2016-05-25 14:05:26.706667
>>> print(current_time.timetuple())
# 返回struct_time格式
time.struct_time(tm_year=2016, tm_mon=5, tm_mday=25, tm_hour=14, tm_min=5, tm_sec=26, tm_wday=2, tm_yday=146, tm_isdst=-1)

替换当前系统时间

>>> print(current_time.replace(2016,5,12))
2016-05-12 14:05:26.706667

将字符串转换成日期格式

>>> str_to_date = datetime.datetime.strptime("21/11/06 16:30", "%d/%m/%y %H:%M")
>>> print(str_to_date)
2006-11-21 16:30:00

时间相加减

比现在加10天

>>> new_date = datetime.datetime.now() + datetime.timedelta(days=10)
>>> print(new_date)
2016-06-04 14:10:36.119523

比现在减10天

>>> new_date = datetime.datetime.now() + datetime.timedelta(days=-10)
>>> print(new_date)
2016-05-15 14:11:06.739814

比现在减10小时

>>> new_date = datetime.datetime.now() + datetime.timedelta(hours=-10)
>>> print(new_date)
2016-05-25 04:11:44.095624

比现在+120s

>>> new_date = datetime.datetime.now() + datetime.timedelta(seconds=120)
>>> print(new_date)
2016-05-25 14:14:02.090219

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