How do you convert numbers to seconds in python?

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Given an integer n (in seconds), convert it into hours, minutes and seconds. Examples:

Input : 12345
Output : 3:25:45

Input : 3600
Output : 1:00:00

Approach #1 : Naive This approach is simply a naive approach to get the hours, minutes and seconds by simple mathematical calculations. 

Python3

def convert(seconds):

    seconds = seconds % (24 * 3600)

    hour = seconds // 3600

    seconds %= 3600

    minutes = seconds // 60

    seconds %= 60

    return "%d:%02d:%02d" % (hour, minutes, seconds)

n = 12345

print(convert(n))

Time Complexity: O(1)
Auxiliary Space: O(1)

  Approach #2 : Alternate to the Naive approach By using the divmod() function, which does only a single division to produce both the quotient and the remainder, you can have the result very quickly with only two mathematical operations. 

Python3

def convert(seconds):

    min, sec = divmod(seconds, 60)

    hour, min = divmod(min, 60)

    return '%d:%02d:%02d' % (hour, min, sec)

n = 12345

print(convert(n))

Time Complexity: O(1)
Auxiliary Space: O(1)

  Approach #3 : Using timedelta (Object of datetime module) Datetime module provides timedelta object which represents a duration, the difference between two dates or times. datetime.timedelta can be used to represent seconds into hours, minutes and seconds format. 

Python3

import datetime

def convert(n):

    return str(datetime.timedelta(seconds = n))

n = 12345

print(convert(n))

Time Complexity: O(1)
Auxiliary Space: O(1)

  Approach #4 : Using time.strftime() time.strftime() gives more control over formatting. The format and time.gmtime() is passed as argument. gmtime is used to convert seconds to special tuple format that strftime() requires. 

Python3

import time

def convert(seconds):

    return time.strftime("%H:%M:%S", time.gmtime(n))

n = 12345

print(convert(n))

Time Complexity: O(1)
Auxiliary Space: O(1)