Time module, pythontime Module

Time module, pythontime Module

I. Introduction

1. in python, these methods are usually used to indicate the time:

1) Timestamp

2) formatted time string

3) Time tuples (struct_time) have nine elements

 

2. UTC is the Greenwich Mean Time, the world standard time. UTC + 8 in China.

3. timestamp: Generally, the timestamp indicates the offset calculated in seconds from 00:00:00, January 1, January 1, 1970. Functions that return timestamp mainly include time.

4. struct_time: struct_time has nine elements. The main functions that return struct_time include gmtime (), localtime (), and strptime (). As follows:

　　

 

Ii. Time Functions

import time

1. time. time () returns the timestamp of the current time.

T = time. time () print (t) # output 1495016507.4327872

　　

2. time. localtime () converts a timestamp to struct_time of the current time zone. If the secs parameter is not provided, the current time prevails.

T1 = time. localtime () print (t1) # output time. struct_time (tm_year = 2017, tm_mon = 5, tm_mday = 17, tm_hour = 18, tm_min = 22, tm_sec = 54, tm_wday = 2, tm_yday = 137, tm_isdst = 0)

　　

3. The time. gmtime () and localtime () methods are similar. The gmtime () method converts a timestamp to UTC _time of the UTC time zone (0 time zone.

T3 = time. gmtime () print (t3) # output time. struct_time (tm_year = 2017, tm_mon = 5, tm_mday = 17, tm_hour = 10, tm_min = 22, tm_sec = 54, tm_wday = 2, tm_yday = 137, tm_isdst = 0)

We can see that the difference between tm_hour and above is 8 hours.

 

4. time. mktime () converts a struct_time to a timestamp.

Print (time. mktime (t1) # output 1495016896.0

 

5. time. asctime () indicates a time tuples or struct_time as follows: 'sun Jun 20 23:21:05 123 '. If no parameter exists, time. localtime () is passed in as the parameter.

Print (time. asctime () # output Wed May 17 19:09:05 2017

　

6. time. ctime () Same as above

 

7. time. strftime (format, t)

Convert a time string or struct_time (such as returned by time. localtime () and time. gmtime () that represents time. If t is not specified, time. localtime () is passed in (). If any element in the tuples crosses the border, the ValueError will be thrown.

T = time. localtime () print (t) print (time. strftime ("% Y-% m-% d % X", t) # output time. struct_time (tm_year = 2017, tm_mon = 5, tm_mday = 17, tm_hour = 19, tm_min = 16, tm_sec = 4, tm_wday = 2, tm_yday = 137, tm_isdst = 0) 19:16:04

　　

 

8. time. strptime (string [, format]): converts a formatted time string to struct_time. In fact, it and strftime () are inverse operations.

T = "17:23:12" print (time. strptime (t, "% Y-% m-% d % H: % M: % S") # output time. struct_time (tm_year = 2017, tm_mon = 5, tm_mday = 16, tm_hour = 17, tm_min = 23, tm_sec = 12, tm_wday = 1, tm_yday = 136, tm_isdst =-1)

　　

Iii. Time Conversion

1. format the string-Timestamp

Import timeprint ("formatted string ". center (20, '-') t = "17:23:12" print (t) print ("time tuples ". center (20, '-') t1 = time. strptime (t, "% Y-% m-% d % H: % M: % S") print (t1) print ("timestamp ". center (20, '-') t2 = time. mktime (t1) print (t2) # output ------- formatted string ------- 17:23:12 -------- time tuples -------- time. struct_time (tm_year = 2017, tm_mon = 5, tm_mday = 16, tm_hour = 17, tm_min = 23, tm_sec = 12, tm_wday = 1, tm_yday = 136, tm_isdst =-1) -------- timestamp --------- 1494926592.0

　　

2. timestamp --- format the string

Import timeprint ("timestamp ". center (20, '-') t = time. time () print (t) print ("time tuples ". center (20, '-') t1 = time. localtime (t) # if time is used here. gmtime () indicates that the generated time tuples have a UTC time difference with the local time. print (t1) print ("Format String ". center (20, '-') t2 = time. strftime ("% Y-% m-% d % X", t1) print (t2) # output -------- timestamp --------- 1495020952.5951612 -------- time tuples -------- time. struct_time (tm_year = 2017, tm_mon = 5, tm_mday = 17, tm_hour = 19, tm_min = 35, tm_sec = 52, tm_wday = 2, tm_yday = 137, tm_isdst = 0) ------- format the string ------- 19:35:52