How Can I Check if 24 Hours Have Passed Between Two Datetimes in Python?

How to Determine if 24 Hours Have Passed Between Datetimes in Python

When developing Python applications that require time tracking, it's crucial to know how to compare the difference between two datetimes. In this specific scenario, the goal is to determine if 24 hours have passed since a given datetime.

To achieve this, we can leverage the following methods:

Method 1: Using timedelta

For UTC datetime objects (without timezone information), you can use timedelta to compare:

from datetime import datetime, timedelta

if (datetime.utcnow() - last_updated) > timedelta(hours=24): 
    # more than 24 hours passed

Method 2: Using time.mktime()

If last_updated is a naive datetime object (without timezone information), you can use time.mktime() to compare:

import time

DAY = 86400
now = time.time()
then = time.mktime(last_updated.timetuple())
if (now - then) > DAY:
    # more than 24 hours passed

Method 3: Using tzlocal

For more complex timezones, consider using tzlocal to normalize the datetime objects before comparing:

from datetime import datetime, timedelta
from tzlocal import get_localzone

tz = get_localzone() 
then = tz.normalize(tz.localize(last_updated)) 
now = datetime.now(tz)
if (now - then) > timedelta(hours=24):
    # more than 24 hours passed

Note:

• For UTC datetime objects, use datetime.utcnow().
• For local time datetime objects, use datetime.now().
• time.mktime() may not work correctly during Daylight Saving Time (DST) transitions.
• tzlocal is a recommended solution for dealing with timezones.

By implementing these methods, you can effectively check if 24 hours have passed between two datetimes, ensuring accurate time-based calculations in your Python programs.

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