Python datetime date yesterday

Get yesterday date in python

In this post, you will learn how to get yesterday’s date in python. We will be using date and timedelta from datetime python module to get it.

from datetime import date, timedelta yesterday_date = date.today() - timedelta(1) print(yesterday_date)

Here, we are importing date and timedelta from datetime module in python. We are following below steps to get yesterday’s date using python.

1. Import date and timedelta form datetime module

2. Getting today’s date using date.today() that will return the current date.

3. Getting time delta for the previous day using timedelta(days=1).

4. Subtracting time delta from today’s date and this will return yesterday’s date.

5. Printing yesterday’s date.

Another example of getting yesterday’s date

from datetime import datetime, timedelta yesterday_datetime = datetime.now() - timedelta(days=1) yesterday_date = yesterday_datetime.strftime('%Y-%m-%d') print(yesterday_date)

In the above code, we are using datetime from datetime module. We are getting current time and date using datetime.now() method and time delta using timedelta(days=1) method. After subtracting this time delta from current date and time we get yesterday’s date with time. Now we are converting it to date only using strftime() function and passing the desired date format as a parameter.

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How to get yesterday’s datetime in Python and Pandas?

You can get the previous day datetime value in python by following this short procedure:

• Use datetime.date.today() function to find the current date.
• Use the datetime.timedelta function to subtract one day from today’s.

Here’s the code that you can use to print the previous date value in Python:

yesterday = datetime.date.today() - datetime.timedelta(days=1)

Datetime to string in python

The code that we posted above returns a datetime object:

This will return datetime.date

We can easily change the format of the returned date using the strftime() function. Note that your datetime object will be converted to a string:

yes_str = yesterday.strftime('%d/%m/%y')

This will effectively return a string with format dd/mm/yy.

Getting yesterday date it yyyy-mm-dd format

As we learnt before, we are able to format our date in many ways. The following code converts our data object to a string with the ubiquitous ‘yyy-mm-dd’ format.

Calculate yesterday time in pandas

If you are using the 3rd party pandas Data Analysis library you might also need to calculate yesterday date and time from a timestamp.

Let’s start by importing the pandas library and initializing a very simple pandas DataFrame:

import pandas as pd stamps = pd.Series(pd.date_range(start='5/1/24', periods = 5, freq ='B')) revenue = [3298, 4617, 3094, 3032, 4393] sales = pd.DataFrame( dict (sale_date = stamps, sales = revenue))

Next we will create a new column (series object) in our DataFrame use the DateOffset function and pass it a days=1 parameter to get the previous date.

sales['day_before'] = sales['sale_date'] - pd.tseries.offsets.DateOffset(days=1)

Let’s take a look at our DataFrame, using the head() method:

Here’s our data, note the new column that has the calculated yesterday dates:

sale_date	sales	day_before
0	2024-05-01	3298	2024-04-30
1	2024-05-02	4617	2024-05-01
2	2024-05-03	3094	2024-05-02
3	2024-05-06	3032	2024-05-05
4	2024-05-07	4393	2024-05-06

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Python Get Yesterday’s Date

To get yesterday’s date in Python, the easiest way is to use the Python timedelta() function from the datetime module.

from datetime import timedelta, date yesterday_date = date.today() - timedelta(days=1) print(date.today()) print(yesterday_date) #Output: 2022-02-08 2022-02-07

When working with data in Python, many times we are working with dates. Being able to manipulate and change dates easily is very important for efficient processing.

One such change is to be able to get yesterday’s date from today’s date.

With Python, we can easily get yesterday’s date from the current date with the help of the datetime module.

To get yesterday’s date, we need to subtract 1 day from today’s date in Python. To do so, we can use the timedelta() function from the datetime module.

Below is code that shows you how to subtract 1 day from today’s date to get yesterday’s date in Python.

from datetime import timedelta, date yesterday_date = date.today() - timedelta(days=1) print(date.today()) print(yesterday_date) #Output: 2022-02-08 2022-02-07

Adding One Day to Get Tomorrow’s Date Using Python

We can easily get tomorrow’s date using the Python datetime module. To get tomorrow’s date, we just need to add 1 day using the timedelta() function.

Below is the Python code which will allow you to get tomorrow’s date.

from datetime import timedelta, date tomorrow_date = date.today() + timedelta(days=1) print(date.today()) print(tomorrow_date) #Output: 2022-02-08 2022-02-09

How to Get Yesterday’s Date With pandas in Python

If you are using the Python pandas module, we can get the date of yesterday easily.

With pandas, to subtract days to from a date, we use the DateOffset() function.

Below is an example of how to use pandas to get yesterday’s date in Python.

import pandas as pd yesterday_date = pd.datetime.now() - pd.DateOffset(days=1)

Hopefully this article has been beneficial for you to learn how to get yesterday’s date using Python.

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