Python Date functions

Importing datetime library

from datetime import date

Today's date

from  datetime import date
dt = date.today() 
print(dt)    # 2019-09-16

Python date and time to get todays tomorrow yesterday dates by using relative delta for calculations

Getting day , month , year and weekday

Commonly used instances

from  datetime import date
print("Today day : ",date.today().day)
print("Today month : ",date.today().month)
print("Today year : ",date.today().year)
print("Today weekday : ",date.today().weekday())

Output

Today day :  16
Today month :  9
Today year :  2019
Today weekday :  0

Tomorrow

from datetime import timedelta,date,datetime
dt = date.today() + timedelta(days=1) # tomorrow 
print(dt)

Yesterday

dt = date.today() + timedelta(days=-1) # Yesterday

More Instance methods:

toodinal()	Proleptic Gregorian ordinal of the date
timetuple()	Details of date and time as a tuple
strftime()	Date & time to String
strptime()	String to datetime object
resolution()	Minimum difference between String to datetime object
replace()	Update date object with new parameters
max() & min()	Maximum and Minimum representable date
isoweekday()	Day of the week as integer
isocalendar()	ISO year, ISO week number & ISO weekday
fromtimestamp()	Getting date and time by using timestamp
fromordinal()	Getting date by using ordinal
fromisoformat()	Getting date by using iso fomat date string

Creating a date object

import datetime
dt=datetime.datetime(2019,5,24)
print(dt.day,dt.month,dt.year) # 24 5 2019

Getting time

import time
h=time.strftime('%I') # getting local hour in 12 hours format as string 
h=int(h)*2 # to multiply the hour as integer 
print (h)

Getting Date and time

from datetime import datetime
now = datetime.now()
print(now) # present date and time 
# use different formats 
dt=datetime.strftime(now,'%Y/%m/%d : %H:%M:%S')
print(dt)

Output

2021-12-22 06:27:52.051532
2021/12/22 : 06:27:52

Read more on strftime() formats to get hour minutes etc.

Creating Date time object.

import datetime
dt=datetime.datetime(2019,5,24,14,52,53)
print(dt.day,dt.month,dt.year) # 24 5 2019 
print(dt.hour,dt.minute,dt.second)# 14 52 53

Output

24 5 2019
14 52 53

Present Year , previous year and Next year

The function strftime() returns string, so we have to convert the output to integer if we are doing any calculation using the output. Note the last line here.

import datetime
today = datetime.datetime.now() # creating date object 
print("Current Year is :",today.year) # Current year as integer

year1 = today.year #The year part or the year attribute
print("Next Year is : ", year1+1) # Year is an integer here.  

year2 = today.strftime("%Y") # Returns year as a string
print("Previous Year is : ",int(year2)-1) # converts to integer then subtract

2nd Saturday	Display 2nd and 4th Saturday of the month
calendar	Calendar module to Create yearly or monthly Calendars
New Year	Show Countdown and new year message

All timedelta objects relativedelta
Exercise on Date & time

Math functions string Python- Tutorials

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