Please let me know how I can improve my code, or maybe a different way of solving it. There are a few lines that could be expanded into multiple lines for better readability, but it’s still pretty clean. Enjoy!

Here is my solution to the Time-Calculator Exercise:

```
def add_time(start,add,day=None):
time, period = start.split()
hour, minutes = map(int,time.split(':')) # converting everything to int
addH, addM = map(int,add.split(':'))
midday = ('PM','AM')
new_day = ''
later = ''
# Clockwork:
# These calculations essentially do the math for capping minutes to 59 and hours to 12
# Divmod and tuple assigment!
carry, minutes = divmod(minutes + addM,60) # 'carry' is 1 (minutes >= 60) or 0 (minutes <= 59)
hour += carry
cycles, hour = divmod(hour + addH,12) # 'cycles' is # of 12-hours (half days) that 'hour' exceeds
# AM or PM:
# We can also think of 'cycles' as the # of switches between AM and PM, this means that an even number of switches doesn't change the period but an odd number will
# Use this logic to subtract 1(odd cycles) or 0(even cycles) from the current period
period = abs(midday.index(period)-(cycles % 2)) # period is an index in midday
passed = (period + cycles) // 2 # 'passed' describes the number of days passed
if hour == 0: # basically an edge case created from my modulus calculations
hour = 12
if minutes < 10: # standardizing time format, 12:1 -> 12:01
minutes = f'0{minutes}'
# Day of Week:
# In one line, we can determine what the current day of the week is by index, add the number of days passed, and get the new day of the week
# The modulus operation will scale the new day, so day 10 -> day 3, day 145 -> day 5, etc.
if day:
week = ('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday')
new_day = f', {week[(week.index(day.capitalize()) + passed) % 7]}'
# Just some string formatting
if passed == 1:
later = ' (next day)'
elif passed != 0:
later = f' ({passed} days later)'
return f'{hour}:{minutes} {midday[period]}{new_day}{later}'
```

Here is a link to the code as well: https://replit.com/@ROOPESH-J/boilerplate-time-calculator#time_calculator.py

Thanks in advance for any suggestions and feel free to ask questions if something is unclear.

Edit: I apologize for the bad formatting in the code block.

Edit: Cleaning up the comments.