python的time几种用法strptime、strftime、localtime、mktime

1、time.time()

import time
t1 = time.time()
print(t1)  # 1594006474.1072185

2、获取当地时间-->结构化时间   time.localtime() 

import time

t2 = time.localtime() 

print(t2)
 #  time.struct_time(tm_year=2020, tm_mon=7, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=2, tm_yday=183, tm_isdst=-1)

3、根据指定格式，获取结构化时间   time.strptime()

import time

 t2 = time.strptime("30 11 2000", "%d %m %Y")

print(t2) 
  # time.struct_time(tm_year=2000, tm_mon=11, tm_mday=30, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=335, tm_isdst=-1)

    %Y  Year with century as a decimal number.
    %m  Month as a decimal number [01,12].
    %d  Day of the month as a decimal number [01,31].
    %H  Hour (24-hour clock) as a decimal number [00,23].
    %M  Minute as a decimal number [00,59].
    %S  Second as a decimal number [00,61].
    %z  Time zone offset from UTC.
    %a  Locale's abbreviated weekday name.
    %A  Locale's full weekday name.
    %b  Locale's abbreviated month name.
    %B  Locale's full month name.
    %c  Locale's appropriate date and time representation.
    %I  Hour (12-hour clock) as a decimal number [01,12].
    %p  Locale's equivalent of either AM or PM.

　　

import time
 t2 = time.strptime("2020-07-01", "%Y{y}%m{y}%d".format(y="-"))

print(t2) 
# time.struct_time(tm_year=2020, tm_mon=7, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=2, tm_yday=183, tm_isdst=-1)

4、根据结构时间，获取指定格式时间  time.strftime()

import time

t2 = time.localtime()  #  time.struct_time(tm_year=2020, tm_mon=7, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=2, tm_yday=183, tm_isdst=-1)


t3 = time.strftime("%Y{y}%m{y}%d".format(y="-"),t2)
print(t3) 
 # 2020-07-01

5、根据结构时间，获取时间戳   time.mktime()

import time

t2 = time.localtime()  #  time.struct_time(tm_year=2020, tm_mon=7, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=2, tm_yday=183, tm_isdst=-1)


t4 = time.mktime(t2)
print(t4)
# 1593532800.0

6、补充datetime用法。

相关链接：https://www.cnblogs.com/pywjh/p/9526094.html

7、date用法

from datetime import date,timedelta

date_today = date.today()

print(date_today)  # 2020-07-11

from datetime import date,timedelta

# date_today = date.today()

# print(date_today)  # 2020-07-11

t1 = timedelta(days=7)

print(t1)  # 7 days, 0:00:00

from datetime import date,timedelta,datetime

# date_today = date.today()

# print(date_today)  # 2020-07-11

# t1 = timedelta(days=7)
#
# print(t1)  # 7 days, 0:00:00


t2 = datetime.strptime("2020-07-01", '%Y-%m-%d')

print(t2)  # 2020-07-01 00:00:00

最后出现神奇的一幕。

from datetime import date,timedelta,datetime

# date_today = date.today()

# print(date_today)  # 2020-07-11

# t1 = timedelta(days=7)
#
# print(t1)  # 7 days, 0:00:00

t2 = datetime.strptime("2020-07-01", '%Y-%m-%d')
#
# print(t2)  # 2020-07-01 00:00:00

t3 = timedelta(days=7)

print(t3)  #  7 days, 0:00:00

t4 = t2 - t3

print(t4)  # 2020-06-24 00:00:00