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

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

Determining whether 24 hours have passed between two datetimes is a common task in programming. The provided method, time_diff, calculates the time difference between the last execution time (last_updated) and a day period 24 hours later. However, to ascertain if 24 hours have specifically elapsed, further steps are required. Here are a few approaches:

1. Naive Datetime Comparison (UTC)

If last_updated represents a naive datetime (without timezone information) in UTC, you can use the datetime module:

from datetime import datetime, timedelta

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

2. Naive Datetime Comparison (Local Time)

If last_updated represents local time, you can use the time module:

import time

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

3. Aware Datetime Comparison (Timezone-Aware)

If last_updated is a timezone-aware datetime, you can convert it to UTC and compare it with the current UTC time:

from datetime import datetime, timedelta

last_updated_utc = last_updated.replace(tzinfo=None) - last_updated.utcoffset()
if (datetime.utcnow() - last_updated_utc) > timedelta(hours=24):
    # More than 24 hours have passed

4. Using the tzlocal Module

The tzlocal module can be used to handle timezone conversions for naive datetimes:

from datetime import datetime, timedelta
from tzlocal import get_localzone

local_timezone = get_localzone()
last_updated_aware = local_timezone.localize(last_updated)
if (datetime.now(local_timezone) - last_updated_aware) > timedelta(hours=24):
    # More than 24 hours have passed

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