What is python timestamp

The timestamp refers to the total number of seconds from Greenwich Mean Time on January 1, 1970 (00:00:00 GMT) to the current time. It is also called Unix Timestamp.

Baidu Encyclopedia defines a timestamp as a piece of complete and verifiable data that can represent that a piece of data existed before a specific time, usually A sequence of characters that uniquely identifies a moment in time.

In python, a timestamp is a string of numbers. When we want to convert it into time data with a certain format, such as '2018-08-08 11:11:11', we need to use to the time module. Likewise, time data can be converted to timestamps.

The specific operations are as follows:

Convert time to timestamp

Reformat time

Convert timestamp to time

Get the current time and convert it to a timestamp (actual requirement)

Convert time to timestamp

Convert the time data 2018-08-08 11:11:11 into a timestamp.

The specific operation process is:

Use the strptime() function to convert the time into a time array! !

Use the mktime() function to convert the time array into a timestamp!!

import time

dt = '2018-08-08 11:11:11'
# 将时间转换成时间数组
timeArray = time.strptime(dt, "%Y-%m-%d %H:%M:%S")
print(timeArray) 
#time.struct_time(tm_year=2018, tm_mon=8, tm_mday=8, tm_hour=11, tm_min=11,tm_sec=11,tm_wday=2,tm_yday=220,tm_isdst=-1)
print(timeArray[0]) # 2018
# 将时间数组转换成时间戳
timestamp = time.mktime(timeArray)
print(timestamp)  # 1533697871.0

Reformat the time

Reformatting the time requires the following Two steps:

Use the strptime() function to convert the time into a time array

Use the strftime() function to reformat the time

import time

dt = '2018-08-08 11:11:11'
# 利用strptime()函数将时间转换成时间数组
timeArray = time.strptime(dt, '%Y-%m-%d %H:%M:%S')
# 利用strftime()函数重新格式化时间
dt_new = time.strftime('%Y-%m-%d - %H:%M:%S',timeArray)
print(dt_new)  # 2018-08-08 - 11:11:11

Convert the timestamp Convert to time

In converting timestamp to time, you first need to convert the timestamp into localtime, and then convert it into the specific format of time:

Use the localtime() function to convert the time Convert the stamp to the localtime format

Use the strftime() function to reformat the time

import time

timestamp = 1533697871.0
# 利用localtime()函数将时间戳转化成时间数组
localtime = time.localtime(timestamp)
print(localtime)  
#time.struct_time(tm_year=2018, tm_mon=8, tm_mday=8,tm_hour=11,tm_min=11,tm_sec=11, tm_wday=2, tm_yday=220, tm_isdst=0)
# 利用strftime()函数重新格式化时间
dt = time.strftime('%Y:%m:%d %H:%M:%S',localtime)
print(dt)  # 2018:08:08 11:11:11

Get the current time in the specified format

Basic steps:

Use time() to obtain the current time,

then use the localtime() function to convert it to a localtime (local) time array,

finally use the strftime() function to reformat it time.

import time

# 获取当前时间
current_time = int(time.time())
print(current_time) # 1537873862
# 转换为localtime
localtime = time.localtime(current_time)
# 利用strftime()函数重新格式化时间
dt = time.strftime('%Y:%m:%d %H:%M:%S', localtime)
print(dt) # 返回当前时间：2019:07:19 4:14:34

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