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Introduction
Time
Date
Datetime
10. Datetime arithmetic
Summary

## Instruction

Good job! We can find the difference between two datetime objects, just as we did with date objects:

fra_mad_actual = datetime.datetime(2018, 12, 1, 9, 45, 0)
now = datetime.datetime.today()
timedelta = now - fra_mad_actual
print('Time since my FRA-MAD flight:', timedelta)


The resulting string will differ based on the moment when you execute the code.

## Exercise

Write a function named starts_in(start_datetime). The function should accept a datetime and return a timedelta that shows how much time is left until the meeting starts. In your solution, assume that start_datetime is in the future, never in the past.

### Stuck? Here's a hint!

Inside the function, define a variable named now:

now = datetime.datetime.today()

Then, calculate the time difference between start_datetime and now.