Notebook

All the IPython Notebooks in Python Date Time Module lecture series by Dr. Milaan Parmar are available @ GitHub

Python `strftime()`¶

In this class, you will learn to convert date, time and datetime objects to its equivalent string (with the help of examples).

The strftime() method returns a string representing date and time using date (@ Example 3), time (@ Example 7) or datetime (@ Example 9) object.

Example 1: datetime to string using `strftime()`¶

The program below converts a datetime object containing current date and time to different string formats.

In [1]:

# Example 1: datetime to string using strftime()

from datetime import datetime

now = datetime.now() # current date and time
print(now)

year = now.strftime("%Y")
print("year:", year)

month = now.strftime("%m")
print("month:", month)

day = now.strftime("%d")
print("day:", day)

time = now.strftime("%H:%M:%S")
print("time:", time)

date_time1 = now.strftime("%m/%d/%Y, %H:%M:%S")
print("date and time:",date_time1)

date_time2 = now.strftime("%d/%m/%Y, %H:%M:%S")
print("date and time:",date_time2)

# When you run the program, the output will be something like below:

2021-10-18 18:01:58.168321
year: 2021
month: 10
day: 18
time: 18:01:58
date and time: 10/18/2021, 18:01:58
date and time: 18/10/2021, 18:01:58

Note: Here, year, day, time and date_time are strings, whereas now is a datetime object.

How `strftime()` works?¶

In the above program, %Y, %m, %d etc. are format codes. The strftime() method takes one or more format codes as an argument and returns a formatted string based on it.

We imported datetime class from the datetime module. It's because the object of datetime class can access strftime() method.

The datetime object containing current date and time is stored in now variable.

The strftime() method can be used to create formatted strings.

The string you pass to the strftime() method may contain more than one format codes.

Example 2: Creating string from a timestamp¶

In [2]:

# Example 2: Creating string from a timestamp

from datetime import datetime

timestamp = 1528797322
date_time = datetime.fromtimestamp(timestamp)

print("Date time object:", date_time)

d = date_time.strftime("%m/%d/%Y, %H:%M:%S")
print("Output 2:", d)	

d = date_time.strftime("%d %b, %Y")
print("Output 3:", d)

d = date_time.strftime("%d %B, %Y")
print("Output 4:", d)

d = date_time.strftime("%I%p")
print("Output 5:", d)

# When you run the program, the output will be something like below:

Date time object: 2018-06-12 15:25:22
Output 2: 06/12/2018, 15:25:22
Output 3: 12 Jun, 2018
Output 4: 12 June, 2018
Output 5: 03PM

Format Code List¶

The table below shows all the codes that you can pass to the strftime() method.

Directive	Meaning	Example
`%a`	Abbreviated weekday name.	Sun, Mon, ...
`%A`	Full weekday name.	Sunday, Monday, ...
`%w`	Weekday as a decimal number.	0, 1, ..., 6
`%d`	Day of the month as a zero-padded decimal.	01, 02, ..., 31
`%-d`	Day of the month as a decimal number.	1, 2, ..., 30
`%b`	Abbreviated month name.	Jan, Feb, ..., Dec
`%B`	Full month name.	January, February, ...
`%m`	Month as a zero-padded decimal number.	01, 02, ..., 12
`%-m`	Month as a decimal number.	1, 2, ..., 12
`%y`	Year without century as a zero-padded decimal number.	00, 01, ..., 99
`%-y`	Year without century as a decimal number.	0, 1, ..., 99
`%Y`	Year with century as a decimal number.	2013, 2019 etc.
`%H`	Hour (24-hour clock) as a zero-padded decimal number.	00, 01, ..., 23
`%-H`	Hour (24-hour clock) as a decimal number.	0, 1, ..., 23
`%I`	Hour (12-hour clock) as a zero-padded decimal number.	01, 02, ..., 12
`%-I`	Hour (12-hour clock) as a decimal number.	1, 2, ... 12
`%p`	Locale’s AM or PM.	AM, PM
`%M`	Minute as a zero-padded decimal number.	00, 01, ..., 59
`%-M`	Minute as a decimal number.	0, 1, ..., 59
`%S`	Second as a zero-padded decimal number.	00, 01, ..., 59
`%-S`	Second as a decimal number.	0, 1, ..., 59
`%f`	Microsecond as a decimal number, zero-padded on the left.	000000 - 999999
`%z`	UTC offset in the form +HHMM or -HHMM.
`%Z`	Time zone name.
`%j`	Day of the year as a zero-padded decimal number.	001, 002, ..., 366
`%-j`	Day of the year as a decimal number.	1, 2, ..., 366
`%U`	Week number of the year (Sunday as the first day of the week). All days in a new year preceding the first Sunday are considered to be in week 0.	00, 01, ..., 53
`%U`	Week number of the year (Monday as the first day of the week). All days in a new year preceding the first Monday are considered to be in week 0.	00, 01, ..., 53
`%c`	Locale’s appropriate date and time representation.	Mon Sep 30 07:06:05 2013
`%x`	Locale’s appropriate date representation.	09/30/13
`%X`	Locale’s appropriate time representation.	07:06:05
`%%`	A literal '%' character.	%

Example 3: Locale's appropriate date and time¶

In [3]:

# Example 3: Locale's appropriate date and time

from datetime import datetime

timestamp = 1528797322
date_time = datetime.fromtimestamp(timestamp)

d = date_time.strftime("%c")
print("Output 1:", d)	

d = date_time.strftime("%x")
print("Output 2:", d)

d = date_time.strftime("%X")
print("Output 3:", d)

# When you run the program, the output will be something like below:

Output 1: Tue Jun 12 15:25:22 2018
Output 2: 06/12/18
Output 3: 15:25:22

Note: Format codes %c, %x and %X are used for locale's appropriate date and time representation.

We also recommend you to check Python strptime(). The strptime() method creates a datetime object from a string.

In [ ]:

Python strftime()¶

Example 1: datetime to string using strftime()¶

How strftime() works?¶