Python timestamp usage and interconversion details

This article shares the specific code of Python timestamp usage and conversion for your reference. The specific content is as follows

1. Converts the time of a string to a timestamp

Methods:

import time 
 
a = "2013-10-10 23:40:00" 
 
#  Convert it to a time array  
timeArray = time.strptime(a, "%Y-%m-%d %H:%M:%S") 
 
#  Convert to timestamp  
timeStamp = int(time.mktime(timeArray)) 
 
timeStamp == 1381419600 

2. String format changes

a =" 2013-10-10 23:40:00", a ="2013/10/10 23:40:00"
Method: Convert to a time array and then to another format

import time 
timeArray = time.strptime(a, "%Y-%m-%d %H:%M:%S") 
otherStyleTime = time.strftime("%Y/%m/%d %H:%M:%S", timeArray) 

3. Time stamp converted to specified format date:

Method 1:

Convert to a time array using localtime() and format to the desired format, such as

import time 
 
timeStamp = 1381419600 
timeArray = time.localtime(timeStamp) 
otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray) 
otherStyletime == "2013-10-10 23:40:00" 

Method 2:

import datetime 
timeStamp = 1381419600 
dateArray = datetime.datetime.utcfromtimestamp(timeStamp) 
otherStyleTime = dateArray.strftime("%Y-%m-%d %H:%M:%S") 
otherStyletime == "2013-10-10 23:40:00" 

4. Gets the current time and converts it to the specified date format

Method 1:

import time 
 
#  Gets the current time timestamp  
now = int(time.time()) 
 
#  Convert to another date format , Such as :"%Y-%m-%d %H:%M:%S" 
timeArray = time.localtime(timeStamp) 
otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray) 

Method 2:

import datetime 
 
# Get current time  
now = datetime.datetime.now() # This is the time array format  
 
# Converts to the specified format : 
otherStyleTime = now.strftime("%Y-%m-%d %H:%M:%S") 

5. Gain 3 days in advance

Methods:

import time 
import datetime 
 
#  First get the date in the time array format  
threeDayAgo = (datetime.datetime.now() - datetime.timedelta(days = 3)) 
 
#  Convert to timestamp : 
timeStamp = int(time.mktime(threeDayAgo.timetuple())) 
 
#  Convert to another string format : 
otherStyleTime = threeDayAgo.strftime("%Y-%m-%d %H:%M:%S") 
 
#  note :timedelta() The parameters are :days,hours,seconds,microseconds 

6. Given a timestamp, calculate the time several days before the time:

timeStamp = 1381419600 
 
#  To convert datetime 
import datetime 
import time 
dateArray = datetime.datetime.utcfromtimestamp(timeStamp) 
threeDayAgo = dateArray - datetime.timedelta(days = 3) 
 
#  reference 5, It can be converted to any other format