python对日期的操作

import datetime

 

 

print ((datetime.datetime.now()-datetime.timedelta(days=1)).strftime("%Y-%m-%d %H:%M"))

print ((datetime.datetime.now()-datetime.timedelta(minutes=1)).strftime("%Y-%m-%d %H:%M"))

print ((datetime.datetime.now()-datetime.timedelta(seconds=1)).strftime("%Y-%m-%d %H:%M"))

　　输出结果

 以下是随机获取15天前的日期和时间实例：

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import datetime import random d = random.randint(0,15) date = ((datetime.datetime.now()-datetime.timedelta(days=d)).strftime("%Y-%m-%d %H:%M:%S")) # print date day = date[0:11] # print "day:", day   h = random.randint(0,24) date = ((datetime.datetime.now()-datetime.timedelta(hours=h)).strftime("%Y-%m-%d %H:%M:%S")) # print date hour = date[11:13] # print "hour: ",hour   m = random.randint(0,15) date = ((datetime.datetime.now()-datetime.timedelta(minutes=m)).strftime("%Y-%m-%d %H:%M:%S")) # print date minue = date[14:16] # print "minue: ", minue s = random.randint(0,24) date = ((datetime.datetime.now()-datetime.timedelta(seconds=s)).strftime("%Y-%m-%d %H:%M:%S")) # print date second = date[17:19] # print "second: ", second   new_time = hour+":"+minue+":"+second print day,new_time

　输出结果：

　

实例：

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#coding:UTF-8   import time import datetime import random   def get_time():     d = random.randint(0,15)     date = ((datetime.datetime.now()-datetime.timedelta(days=d)).strftime("%Y-%m-%d %H:%M:%S"))     # print date     day = date[0:11]     # print "day:", day            h = random.randint(0,24)     date = ((datetime.datetime.now()-datetime.timedelta(hours=h)).strftime("%Y-%m-%d %H:%M:%S"))     # print date     hour = date[11:13]     # print "hour: ",hour            m = random.randint(0,15)     date = ((datetime.datetime.now()-datetime.timedelta(minutes=m)).strftime("%Y-%m-%d %H:%M:%S"))     # print date     minue = date[14:16]     # print "minue: ", minue     s = random.randint(0,24)     date = ((datetime.datetime.now()-datetime.timedelta(seconds=s)).strftime("%Y-%m-%d %H:%M:%S"))     # print date     second = date[17:19]     # print "second: ", second            new_time = hour+":"+minue+":"+second     return day.strip(),new_time.strip()   day,times=get_time() print day print times str_1 = '{"PN":"34VT123","DUID":"XXXX","location":{"coordinates":[-100.35256443,33.4586858]},"SPD":125,"DT":"' str_2 = 'Z","driverID":"XXXXX","cate":"event","subCate":"OBDII","eventOBDII":{"what":"emergencyBrake","param":2,"GID":123456479}}' des_str = '2017-06-02T13:15:20' str_des = str_1 + day + 'T' + times + str_2 print str_des

　输出

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> "D:Python27python.exe"  "F:MQTT_testingdata.py" 2017-05-26 02:21:19 {"PN":"34VT123","DUID":"XXXX","location":{"coordinates":[-100.35256443,33.4586858]},"SPD":125,"DT":"2017-05-26T02:21:19Z","driverID":"XXXXX","cate":"event","subCate":"OBDII","eventOBDII":{"what":"emergencyBrake","param":2,"GID":123456479}}