import datetime
import time

DATETIME_FORMAT = "%Y-%m-%d %H:%M:%S"
TIME_FORMAT = "%H:%M:%S"

#當前毫秒數
def curMilis():
    return int(time.time() * 1000)

#當前秒數
def curSeconds():
    return int(time.time())

#當前日期  格式%Y-%m-%d %H:%M:%S
def curDatetime():
    return datetime.datetime.strftime(datetime.datetime.now(),DATETIME_FORMAT)

#當前日期  格式%Y-%m-%d
 

def curDate():
    return datetime.date.today()

#當前時間  格式%Y-%m-%d
def curTime():
    return time.strftime(TIME_FORMAT)

#秒轉日期
def secondsToDatetime(seconds):
    return time.strftime(DATETIME_FORMAT,time.localtime(seconds))

#毫秒轉日期
def milisToDatetime(milix):
    return time.strftime(DATETIME_FORMAT,time.localtime(milix//1000
 
))

#日期轉毫秒
def datetimeToMilis(datetimestr):
    strf = time.strptime(datetimestr,DATETIME_FORMAT)
    return int(time.mktime(strf)) * 1000

#日期轉秒
def datetimeToSeconds(datetimestr):
    strf = time.strptime(datetimestr,DATETIME_FORMAT)
    return int(time.mktime(strf))

#當前年
def curYear():
    return datetime.datetime.now().year
#當前月
 

def curMonth():
    return datetime.datetime.now().month

#當前日
def curDay():
    return datetime.datetime.now().day

#當前時
def curHour():
    return datetime.datetime.now().hour

#當前分
def curMinute():
    return datetime.datetime.now().minute

#當前秒
def curSecond():
    return datetime.datetime.now().second

#星期幾
def curWeek():
    return datetime.datetime.now().weekday()

#幾天前的時間
def nowDaysAgo(days):
    daysAgoTime = datetime.datetime.now() - datetime.timedelta(days = days)
    return time.strftime(DATETIME_FORMAT,daysAgoTime.timetuple())

#幾天後的時間
def nowDaysAfter(days):
    daysAgoTime = datetime.datetime.now() + datetime.timedelta(days = days)
    return time.strftime(DATETIME_FORMAT,daysAgoTime.timetuple())

#某個日期幾天前的時間
def dtimeDaysAgo(dtimestr,days):
    daysAgoTime = datetime.datetime.strptime(dtimestr,DATETIME_FORMAT) - datetime.timedelta(days = days)
    return time.strftime(DATETIME_FORMAT,daysAgoTime.timetuple())

#某個日期幾天前的時間
def dtimeDaysAfter(dtimestr,days):
    daysAgoTime = datetime.datetime.strptime(dtimestr,DATETIME_FORMAT) + datetime.timedelta(days = days)
    return time.strftime(DATETIME_FORMAT,daysAgoTime.timetuple())


secondStamp = curSeconds()
print("當前秒：",secondStamp)
milisStamp = curMilis()
print("當前毫秒：",milisStamp)

curdTime = curDatetime()
print("當前時間：",curdTime)
curDate = curDate()
print("當前日期：",curDate)
curT = curTime()
print("當前時刻：",curT)


stdtime = secondsToDatetime(secondStamp)
print("秒轉時間：",stdtime)
mtdtime = milisToDatetime(milisStamp)
print("毫秒轉時間：",mtdtime)
dtimetm = datetimeToMilis(mtdtime)
print("時間轉毫秒：",dtimetm)
dtimets = datetimeToSeconds(mtdtime)
print("時間轉秒：",dtimets)

year = curYear()
print("年：",year)
month = curMonth()
print("月：",month)
day = curDay()
print("日：",day)
hour = curHour()
print("時：",hour)
minute = curMinute()
print("分：",minute)
second = curSecond()
print("秒：",second)
week = curWeek()
print("星期：",week)

輸出結果如下：

當前秒： 1518341913
當前毫秒： 1518341913403
當前時間： 2018-02-11 17:38:33
當前日期： 2018-02-11
當前時刻： 17:38:33
秒轉時間： 2018-02-11 17:38:33
毫秒轉時間： 2018-02-11 17:38:33
時間轉毫秒： 1518341913000
時間轉秒： 1518341913
年： 2018
月： 2
日： 11
時： 17
分： 38
秒： 33
星期： 6
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