How do I convert datetime.timedelta to minutes, hours in Python?


Question

I get a start_date like this:

from django.utils.timezone import utc
import datetime

start_date = datetime.datetime.utcnow().replace(tzinfo=utc)
end_date = datetime.datetime.utcnow().replace(tzinfo=utc)
duration = end_date - start_date

I get output like this:

datetime.timedelta(0, 5, 41038)

How do I convert this into normal time like the following?

10 minutes, 1 hour like this

1
40
10/29/2018 11:17:30 PM

Accepted Answer

There's no built-in formatter for timedelta objects, but it's pretty easy to do it yourself:

days, seconds = duration.days, duration.seconds
hours = days * 24 + seconds // 3600
minutes = (seconds % 3600) // 60
seconds = seconds % 60

Or, equivalently, if you're in Python 2.7+ or 3.2+:

seconds = duration.total_seconds()
hours = seconds // 3600
minutes = (seconds % 3600) // 60
seconds = seconds % 60

Now you can print it however you want:

'{} minutes, {} hours'.format(minutes, hours)

For example:

def convert_timedelta(duration):
    days, seconds = duration.days, duration.seconds
    hours = days * 24 + seconds // 3600
    minutes = (seconds % 3600) // 60
    seconds = (seconds % 60)
    return hours, minutes, seconds
td = datetime.timedelta(2, 7743, 12345)
hours, minutes, seconds = convert_timedelta(td)
print '{} minutes, {} hours'.format(minutes, hours)

This will print:

9 minutes, 50 hours

If you want to get "10 minutes, 1 hour" instead of "10 minutes, 1 hours", you need to do that manually too:

print '{} minute{}, {} hour{}'.format(minutes, 's' if minutes != 1 else '',
                                      hours, 's' if minutes != 1 else '')

Or you may want to write an english_plural function to do the 's' bits for you, instead of repeating yourself.

From your comments, it sounds like you actually want to keep the days separate. That's even easier:

def convert_timedelta(duration):
    days, seconds = duration.days, duration.seconds
    hours = seconds // 3600
    minutes = (seconds % 3600) // 60
    seconds = (seconds % 60)
    return days, hours, minutes, seconds

If you want to convert this to a single value to store in a database, then convert that single value back to format it, do this:

def dhms_to_seconds(days, hours, minutes, seconds):
    return (((days * 24) + hours) * 60 + minutes) * 60 + seconds

def seconds_to_dhms(seconds):
    days = seconds // (3600 * 24)
    hours = (seconds // 3600) % 24
    minutes = (seconds // 60) % 60
    seconds = seconds % 60
    return days, hours, minutes, seconds

So, putting it together:

def store_timedelta_in_database(thingy, duration):
    seconds = dhms_to_seconds(*convert_timedelta(duration))
    db.execute('INSERT INTO foo (thingy, duration) VALUES (?, ?)',
               thingy, seconds)
    db.commit()

def print_timedelta_from_database(thingy):
    cur = db.execute('SELECT duration FROM foo WHERE thingy = ?', thingy)
    seconds = int(cur.fetchone()[0])
    days, hours, minutes, seconds = seconds_to_dhms(seconds)
    print '{} took {} minutes, {} hours, {} days'.format(thingy, minutes, hours, days)
88
1/7/2013 5:50:19 AM

A datetime.timedelta corresponds to the difference between two dates, not a date itself. It's only expressed in terms of days, seconds, and microseconds, since larger time units like months and years don't decompose cleanly (is 30 days 1 month or 0.9677 months?).

If you want to convert a timedelta into hours and minutes, you can use the total_seconds() method to get the total number of seconds and then do some math:

x = datetime.timedelta(1, 5, 41038)  # Interval of 1 day and 5.41038 seconds
secs = x.total_seconds()
hours = int(secs / 3600)
minutes = int(secs / 60) % 60

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