The difference and connection between Python time and datetime

One. Time module

Time module provides functions for various operating times
There are generally two ways to represent time:
The first is the way the timestamp is (relative to the offset from 1970.1.1 00:00:00 in seconds), the timestamp is unique

#当前时间的时间戳 in [9]: Time.time () out[9]: 1376102328.536908

The second is represented as an array of (Struct_time), a total of nine elements, respectively, that the same timestamp of the struct_time will vary depending on the time zone

In [2]: Time.localtime () out[2]: Time.struct_time (tm_year=2013, tm_mon=8, tm_mday=10, tm_hour=10, tm_min=30, tm_sec=47, Tm_wday=5, tm_yday=222, tm_isdst=0)

 gmtime () With Mktime () two time representations can be freely converted

In []: Time.gmtime (Time.time ()) out[22]: Time.struct_time (tm_year=2013, tm_mon=8, tm_mday=10, tm_hour=2, tm_min=46, tm_sec=54, Tm_wday=5, tm_yday=222, tm_isdst=0) in [23°c]: Time.mktime (Time.localtime ()) out[23]: 1376102845.0

Strftime () can convert the Struct_time type freely into character type

In []: Time.strftime ("%y%m%d", Time.localtime ()) out[24]: ' 20130810 '

Strptime (string, format) converts a time string to an array of time based on the specified format character

in [+]: time.strptime (' 20130810 ', "%y%m%d") out[26]: Time.struct_time (tm_year=2013, tm_mon=8, tm_mday=10, tm_hour=0, Tm_min=0, Tm_sec=0, tm_wday=5, tm_yday=222, Tm_isdst=-1)

Note that the timestamp cannot be converted directly to a string, and the time string cannot be converted directly to a timestamp, but only through localtime, using the Mktime method to turn

Two. DateTime module

in [+]: Datetime.datetime.now () out[27]: Datetime.datetime (2013, 8, 10, 10, 56, 10, 611490)

Strftime method, you can convert a datetime date to a string

in [+]: Datetime.datetime.now (). Strftime ("%y%m%d") out[28]: ' 20130810 '

Datetime.strptime (date_string, format): Converts a format string to a DateTime object

in [+]: Datetime.datetime.strptime ("20130810", "%y%m%d") out[30]: Datetime.datetime (2013, 8, 10, 0, 0)

Three. Calculate the first 1 days of the current time

One_day_before = Datetime.datetime.today ()-Datetime.timedelta (Days=1)

Day: Days

Hours: Hours

Minutes: Minutes

Four. Conversion between Time and DateTime

Time to DateTime

A = Time.time () datetime.datetime.fromtimestamp (a)

DateTime converted to TIME

b = Datetime.datetime.now () time.mktime (B.timetuple ())

Reference: http://iam42.iteye.com/blog/1922875

http://blog.csdn.net/hong201/article/details/3193121

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The difference and connection between Python time and datetime