Python Date and Time Inbuilt Functions

Python has a module named “datetime” to work with dates and times.

Get Current(System) Date and Time

Python script to display system date and time

Example:

#to display date and time
import datetime
dt = datetime.datetime.now()
print("date time is ",dt)
print(dt) 

Output:

date time is 2019-11-10 04:52:16.516284
2019-11-10 04:52:16.516284
>>>

To display only date

In this program, we have used today() method defined in the date class to get a date object containing the current local date.

Example:

import datetime
dt = datetime.date.today()
print(dt)

Output:

2019-11-10
>>>

Example:

from datetime import date
today = date.today()
print("Current date =", today)

Output:

Current date = 2019-11-10
>>>

To display day , month and year parts of the date

Print today’s year, month and day

We can get year, month, day, day of the week etc. from the date object easily.

Example:

from datetime import date
#date object of today's date
today = date.today() 
print("Current year:", today.year)
print("Current month:", today.month)
print("Current day:", today.day)

Output:

Current year: 2019
Current month: 11
Current day: 10
>>>

To display hour, min and sec parts of time
We can also create date objects from a timestamp. A Unix timestamp is the number of seconds between a particular date and January 1, 1970.

Example:

from datetime import datetime
a = datetime.now()
#to display hour,min and sec
print("hour =", a.hour)
print("minute =", a.minute)
print("timestamp =", a.timestamp())

Output:

hour = 4
minute = 57
timestamp = 1573342028.110114
>>>

To display day, month, year, hour , min and second

Example:

from datetime import datetime
a = datetime.now()
#to display day,month and year
print("year =", a.year)
print("month =", a.month)
print("day =", a.day)
to display hour,min and sec
print("hour =", a.hour)
print("minute =", a.minute)
print("timestamp =", a.timestamp())

Output:

year = 2019
month = 11
day = 10
hour = 4
minute = 58
timestamp = 1573342105.516302
>>>

To display date in a formmatted manner

Example:

from datetime import datetime
a = datetime.now()
#to display day,month and year
print("dd/mm/yyyy")
print(a.day,"/",a.month,"/",a.year)
print("mm/dd/yyyy")
print(a.month,"/",a.day,"/",a.year)
#to display hour,min and sec
print("hh:mm:ss")
print(a.hour,":",a.minute,":",a.second)
print("timestamp =", a.timestamp())

Output:

dd/mm/yyyy
10 / 11 / 2019
mm/dd/yyyy
11 / 10 / 2019
hh:mm:ss
5 : 46 : 9
timestamp = 1573344969.664423
>>>

Example : Get date from a timestamp

You can convert a timestamp to date using fromtimestamp() method.

from datetime import datetime
from datetime import date
a = datetime.now()
print("timestamp =", a.timestamp())
ts=a.timestamp()
d1=date.fromtimestamp(ts)
print(ts)
print(d1)
print(d1.day," ",d1.month," ",d1.year)

Output:

timestamp = 1573345238.680002
1573345238.680002
2019-11-10
10 11 2019
>>>

Python format datetime

The date and time is represented differently in different places, organizations etc. It’s more common to use mm/dd/yyyy in the US, whereas dd/mm/yyyy is more common in the UK.
Python has strftime() and strptime() methods to handle this.

Python strftime() – datetime object to string
The strftime() method is defined under classes date, datetime and time. The method creates a formatted string from a given date, datetime or time object.

Here we use %Y, %m, %d, %H format codes.
The strftime() method takes one or more format codes and returns a formatted string based on it.
In the above program, t, s1 and s2 are strings.
• %Y – year [0001,…, 2018, 2019,…, 9999]
• %m – month [01, 02, …, 11, 12]
• %d – day [01, 02, …, 30, 31]
• %H – hour [00, 01, …, 22, 23
• %M – month [00, 01, …, 58, 59]
• %S – second [00, 01, …, 58, 59]

Example:

#Example : Format date using strftime()
from datetime import datetime
#current date and time
now = datetime.now()
t = now.strftime("%H:%M:%S")
print("time:", t)
s1 = now.strftime("%m/%d/%Y, %H:%M:%S")
#mm/dd/YY H:M:S format
print("mm/dd/yy :", s1)
s2 = now.strftime("%d/%m/%Y, %H:%M:%S")
#dd/mm/YY H:M:S format
print("dd/mm/yy : ", s2)

Output:

time: 05:54:37
mm/dd/yy : 11/10/2019, 05:54:37
dd/mm/yy : 10/11/2019, 05:54:37
>>>

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