How should I practice Days Between?

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Problem · Math

Days Between

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Problem statement

Write a function daysBetween that returns the number of days between two calendar dates.

Each date is represented by three integers: year, month, and day. The first date is guaranteed to occur before the second date.

Do not use system-provided date objects or built-in date-difference helpers. Compute the answer directly from the date components.

Function

daysBetween(year1: int, month1: int, day1: int, year2: int, month2: int, day2: int) → int

Complete the function daysBetween in the editor below.

daysBetween has the following parameters:

int year1: the year of the first date
int month1: the month of the first date
int day1: the day of the first date
int year2: the year of the second date
int month2: the month of the second date
int day2: the day of the second date

Returns

int: the number of days between the two dates

Examples

Example 1

year1 = 2010month1 = 5day1 = 1year2 = 2011month2 = 5day2 = 1return = 365

From 2010-05-01 to 2011-05-01 there are 365 days.

Example 2

year1 = 2020month1 = 2day1 = 27year2 = 2020month2 = 3day2 = 1return = 3

The interval crosses leap day in 2020: Feb 27 -> Feb 28 -> Feb 29 -> Mar 1, so the difference is 3 days.

Example 3

year1 = 2019month1 = 12day1 = 31year2 = 2020month2 = 1day2 = 1return = 1

The dates are consecutive calendar days across a year boundary.

Constraints

1 ≤ month1, month2 ≤ 12
Both input dates are valid calendar dates.
The first date always occurs before the second date.
Do not use built-in date libraries or system date objects.