Python datetime lambda

In this article, we have explained how to extract date and time in Python using 4 different Lambda functions.

Table of contents:

1. Approach 1: Lambda printing complete date and time
2. Approach 2: No need to save datetime object
3. Approach 3: Lambda function to extract info from datetime object
4. Approach 4: Lambda function to return info directly

Approach 1: Lambda printing complete date and time

The idea is to get the get time and date in the form of a datetime object using datetime.now() function. We use lambda to extract different information like year and month.

Following Python code extracts the date and time using lambda:

import datetime
now = datetime.datetime.now()
print("Date/Time: ", now)
f = lambda x: print("Year: ", x.year, ", Month: ", x.month, ", Day: ", x.day, ", Time: ", x.time())
f(now)

Output:

Date/Time:  2022-11-27 19:00:37.765894
Year:  2022 , Month:  11 , Day:  27 , Time:  19:00:37.765894

Approach 2: No need to save datetime object

In this case, we directly use the datetime.now() function within the lambda to extract different information.

import datetime
f = lambda : print("Year: ", datetime.datetime.now().year, 
", Month: ", datetime.datetime.now().month, 
", Day: ", datetime.datetime.now().day, 
", Time: ", datetime.datetime.now().time())
f()

Output:

Year:  2022 , Month:  11 , Day:  27 , Time:  19:22:28.441521

Approach 3: Lambda function to extract info from datetime object

In this, we define different functions using lambda that can extract different information from datetime object.

import datetime
now = datetime.datetime.now()
print("Date/ Time: ", now)
year = lambda x: x.year
month = lambda x: x.month
day = lambda x: x.day
time = lambda x: x.time()
print("Year: ", year(now))
print("Month: ", month(now))
print("Day: ", day(now))
print("Time: ", time(now))

Output:

Date/ Time:  2022-11-27 19:05:59.423488
Year:  2022
Month:  11
Day:  27
Time:  19:05:59.423488

Approach 4: Lambda function to return info directly

In this case, we define functions using lambda which return the required date value (month, year and others) directly. This does not require a datetime object to be passed to the lambda function.

import datetime
year = lambda : datetime.datetime.now().year
month = lambda : datetime.datetime.now().month
day = lambda : datetime.datetime.now().day
time = lambda : datetime.datetime.now().time()
print("Year: ", year())
print("Month: ", month())
print("Day: ", day())
print("Time: ", time())

Output:

Year:  2022
Month:  11
Day:  27
Time:  19:05:23.505240

With this article at OpenGenus, you must have the complete idea of using lambda to get current date and time.