Calculating time difference between times and splitting the HH and MM

[DeaD_EyE]

It seems to be calculating correctly. If the only problem is getting the hours and minutes into a string, you can calculate that from the seconds attribute of the timedelta object:

hours = countdown.seconds // 3600
minutes = (countdown.seconds // 60) % 60
print('The market opens in {} hours and {} minutes.'.format(hours, minutes))

Alternate way.

from collections import namedtuple
def to_hms(seconds):
   st_time = namedtuple('time', 'hours minutes seconds')
   minutes, seconds = divmod(seconds, 60)
   hours, minutes = divmod(minutes, 60)
   return st_time(hours, minutes, seconds)

countdown = to_hms(3660)
print(f"Sydney opens in {countdown.hours} hours and {countdown.minutes} minutes")

Output:
Sydney opens in 1 hours and 1 minutes

Btw: namedtuple is underused. But the interesting part is divmod.