1. Get Current Time.
>>> import datetime,time
>>>
>>> now = time.strftime("%Y-%m-%d %H:%M:%S")
>>>
>>> print(now)
2019-03-29 21:27:20
>>>
>>> now = datetime.datetime.now()
>>>
>>> print(now)
2019-03-29 21:27:20.218849
2. Get The Date Of Last Month’s Last Day.
>>> delta_day = datetime.timedelta(1) >>> >>> this_month_first_day = datetime.date(datetime.date.today().year,datetime.date.today().month,1) >>> >>> this_month_first_day datetime.date(2019, 3, 1) >>> >>> last = this_month_first_day - delta_day >>> >>> print(last) 2019-02-28
3. Gets The Time Difference (in Seconds).
Time difference is often used to calculate the running time of a program.
>>> start_time = datetime.datetime.now() >>> >>> #long running ... time.sleep(1) >>> >>> end_time = datetime.datetime.now() >>> >>> delta_time = end_time - start_time >>> >>> print(delta_time) 0:00:01.001518 >>> >>> print(delta_time.seconds) 1 >>> >>> print(delta_time.microseconds) 1518
4. Calculate The Time 2 Hours Backward From Current Time.
>>> d1 = datetime.datetime.now() >>> >>> d1.ctime() 'Fri Mar 29 21:58:25 2019' >>> >>> d2 = d1 + datetime.timedelta(hours=2) >>> >>> d2.ctime() 'Fri Mar 29 23:58:25 2019' >>>
5. Get Today, Yesterday and Tomorrow.
>>> today=datetime.date.today() >>> >>> today datetime.date(2019, 3, 29) >>> >>> oneday=datetime.timedelta(days=1) >>> >>> yesterday=today - oneday >>> >>> yesterday datetime.date(2019, 3, 28) >>> >>> tomorrow=today + oneday >>> >>> tomorrow datetime.date(2019, 3, 30)
6. Get The Date Of A Few Previous Days Of A Given Time In A List.
>>> today=datetime.date.today() >>> >>> today datetime.date(2019, 3, 29) >>> >>> oneday=datetime.timedelta(days=1) >>> >>> li=[] >>> >>> for i in range(0,3): ... today=today-oneday ... today_str = str(today)[0:10] ... li.append(today_str) ... >>> li ['2019-03-28', '2019-03-27', '2019-03-26'] >>>
7. Converts A String To Datetime Type.
>>> datetime.datetime.strptime('2019-03-29','%Y-%m-%d')
datetime.datetime(2019, 3, 29, 0, 0)
8. Get Year, Month, Day In Time String.
>>> now = datetime.datetime.now() >>> >>> now datetime.datetime(2019, 3, 29, 22, 15, 6, 98877) >>> >>> str(now)[0:10] '2019-03-29'
9. Calculate How Many Days Are The Two Dates Apart.
>>> begin_date_str = '2018-03-1' >>> >>> end_date_str = '2019-01-03' >>> >>> format="%Y-%m-%d"; >>> >>> begin_date = datetime.datetime.strptime(begin_date_str,format) >>> >>> end_date = datetime.datetime.strptime(end_date_str,format) >>> >>> one_day=datetime.timedelta(days=1) >>> >>> count=0 >>> >>> while begin_date != end_date: ... end_date = end_date - one_day ... count+=1 ... >>> count 308
10. Get All Date String In A List Between Begin And End Date.
>>> begin_date_str = '2019-01-1' >>> >>> end_date_str = '2019-01-03' >>> >>> format="%Y-%m-%d"; >>> >>> begin_date = datetime.datetime.strptime(begin_date_str,format) >>> >>> end_date = datetime.datetime.strptime(end_date_str,format) >>> >>> one_day=datetime.timedelta(days=1) >>> >>> li = [] >>> >>> while begin_date <= end_date: ... li.append(str(begin_date)[0:10]) ... begin_date = begin_date + one_day ... >>> li ['2019-01-01', '2019-01-02', '2019-01-03'] >>>
11. Get Year Of Current Time.
>>> dt = datetime.datetime.now() >>> dt datetime.datetime(2019, 3, 29, 22, 56, 21, 760158) >>> dt.year 2019
12. Get Month Of Current Time.
>>> dt = datetime.datetime.now() >>> dt datetime.datetime(2019, 3, 29, 22, 56, 21, 760158) >>> dt.month 3
