datetime 库
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from datetime import datetime, timedelta
# 字符串 转 datetime类型
another_day_str = '2020-07-18 21:00:00'
another_day_datetime = datetime.strptime(another_day_str, '%Y-%m-%d %H:%M:%S')
# 时间加减运算， 增加1小时30分30秒
after_datetime = another_day_datetime + timedelta(hours=1, minutes=30, seconds=30)
# datetime类型 转 字符串 2020-07-18 22:30:30
after_str = after_datetime.strftime('%Y-%m-%d %H:%M:%S')
# 获取当前时间的字符串 格式化输出 20200719223030
now_datetime = datetime.now()
now_str = now_datetime.strftime('%Y%m%d%H%M%S')
# 转换为时间戳
timestamp = time.mktime(now_datetime.timetuple())
# 时间戳转换为datetime
datetime.datetime.fromtimestamp(timestamp)
# 获取间隔天数
day = (now_datetime - another_day_datetime).days
# 获取间隔秒数（不包含天数差）
second = (now_datetime - another_day_datetime).seconds
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time库
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import time
# 返回当前时间的时间戳（1970纪元后经过的浮点秒数）
timestamp = time.time()
# 时间戳转换为 struct_time类型(结构体时间)
struct_time = time.localtime(timestamp)
# 字符串转结构体时间 struct_time
now_str = '2020-07-19 21:00:00'
struct_time = time.strptime(now_str, "%Y-%m-%d %H:%M:%S")
# time.struct_time(tm_year=2020, tm_mon=7, tm_mday=19, tm_hour=21, tm_min=0, tm_sec=0, tm_wday=6, tm_yday=201, tm_isdst=-1) <class 'time.struct_time'>
# struct_time 转 格式化字符串 20200719210000
str_time = time.strftime('%Y%m%d%H%M%S', struct_time)
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Commonly used format codes:
%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.
struct_time parameter
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tm_gmtoff """offset from UTC in seconds"""
tm_hour """hours, range [0, 23]"""
tm_isdst """1 if summer time is in effect, 0 if not, and -1 if unknown"""
tm_mday """day of month, range [1, 31]"""
tm_min """minutes, range [0, 59]"""
tm_mon """month of year, range [1, 12]"""
tm_sec """seconds, range [0, 61])"""
tm_wday """day of week, range [0, 6], Monday is 0"""
tm_yday """day of year, range [1, 366]"""
tm_year """year, for example, 1993"""
tm_zone """abbreviation of timezone name"""
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