Add hours to datetime in Python

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Borislav Hadzhiev

Last updated: Jun 22, 2022

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Add hours to datetime in Python #

Use the timedelta() class from the datetime module to add hours to datetime, e.g. result = dt + timedelta(hours=10). The timedelta class can be passed a hours argument and adds the specified number of hours to the datetime.

main.py
from datetime import datetime, timedelta # ✅ parse datetime string and add hours to datetime d = '2023-11-24 09:30:00.000123' # 👇️ convert string to datetime object dt = datetime.strptime(d, '%Y-%m-%d %H:%M:%S.%f') print(dt) # 👉️ 2023-11-24 09:30:00.000123 result_1 = dt + timedelta(hours=3) print(result_1) # 👉️ 2023-11-24 12:30:00.000123 # ----------------------- # ✅ add hours to datetime dt_2 = datetime(2023, 9, 24, 9, 30, 35) print(dt_2) # 👉️ 2023-09-24 09:30:35 result_2 = dt_2 + timedelta(hours=4) print(result_2) # 👉️ 2023-09-24 13:30:35 # ------------------------ # ✅ add hours to current time now = datetime.today() print(now) # 👉️ 2022-06-22 13:10:20.515437 result_3 = now + timedelta(hours=5) print(result_3) # 👉️ 2022-06-22 18:10:20.515437
If you only have a time component, e.g. 09:30:15 scroll down to the last code snippet.

Make sure to import the datetime and timedelta classes from the datetime module.

The first example creates a datetime object from a datetime string and adds hours to it.

main.py
from datetime import datetime, timedelta # ✅ parse datetime string and add hours to datetime d = '2023-11-24 09:30:00.000123' # 👇️ convert string to datetime object dt = datetime.strptime(d, '%Y-%m-%d %H:%M:%S.%f') print(dt) # 👉️ 2023-11-24 09:30:00.000123 result_1 = dt + timedelta(hours=3) print(result_1) # 👉️ 2023-11-24 12:30:00.000123

The datetime.strptime() method returns a datetime object that corresponds to the provided date string, parsed according to the format.

If you have a date string that is formatted in a different way, use this table of the docs to look up the format codes you should pass as the second argument to the strptime() method.

The second example uses the datetime class to create a datetime object and the timedelta class to add hours to it.

main.py
from datetime import datetime, timedelta dt_2 = datetime(2023, 9, 24, 9, 30, 35) print(dt_2) # 👉️ 2023-09-24 09:30:35 result_2 = dt_2 + timedelta(hours=4) print(result_2) # 👉️ 2023-09-24 13:30:35

We passed values for the year, month, day, hour, minute and second arguments.

The third example adds hours to the current time.

main.py
from datetime import datetime, timedelta # ✅ add hours to current time now = datetime.today() print(now) # 👉️ 2022-06-22 13:10:20.515437 result_3 = now + timedelta(hours=5) print(result_3) # 👉️ 2022-06-22 18:10:20.515437

The datetime.today() method returns the current local datetime.

We need to use a datetime object because it automatically rolls over the days, months and years if necessary.

This wouldn't be possible if we only had the time component. For example, 11:59:30PM + 2 hours would raise an exception.

If you only have the time component, use the datetime.combine method to combine the time with the current (or some other) date and get a datetime object.
main.py
from datetime import datetime, date, timedelta, time t = time(6, 25) print(t) # 👉️ 06:25:00 result = datetime.combine(date.today(), t) + timedelta(hours=6) print(result) # 👉️ 2022-06-22 12:25:00 only_t = result.time() print(only_t) # 👉️ 12:25:00

The datetime.combine method takes a date and time as arguments and returns a new datetime object by combining them.

Once we get a datetime object, we can use the timedelta class to add hours to it.

Use the time() method on the datetime object if you only need to extract the time after the operation.

main.py
from datetime import datetime, date, timedelta, time t = time(6, 25) print(t) # 👉️ 06:25:00 result = datetime.combine(date.today(), t) + timedelta(hours=6) print(result) # 👉️ 2022-06-22 12:25:00 # ✅ only get updated time only_t = result.time() print(only_t) # 👉️ 12:25:00

The datetime.time method returns a time object with the same hour, minute, second and millisecond.

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