How Can I Efficiently Determine if 24 Hours Have Passed Between Two Python `datetime` Objects?

Calculating Time Difference to Determine if 24 Hours Have Passed

The task involves determining whether 24 hours have passed between two dates or times stored in a datetime object. Here's a solution in Python:

Using Naive Datetime Objects

If the datetime object represents a naive time (without timezone information):

from datetime import datetime, timedelta

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

Using Local Time Objects

If last_updated represents local time:

import time

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

Using tzlocal Module (Recommended)

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 since last_updated

This method handles cases where timezones may have changed or Daylight Saving Time (DST) offsets have been adjusted.

Notes:

• If last_updated is an aware datetime object (with timezone information), subtract the UTC offset before comparing.
• Working with UTC time minimizes timezone issues and is generally recommended.

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