Number of Days Between Two Dates

Write a program to count the number of days between two dates.

The two dates are given as strings, their format is YYYY-MM-DD as shown in the examples.

 

Example 1:

Input: date1 = "2019-06-29", date2 = "2019-06-30"
Output: 1

Example 2:

Input: date1 = "2020-01-15", date2 = "2019-12-31"
Output: 15

 

Constraints:

• The given dates are valid dates between the years 1971 and 2100.

Example Testcases:

"2019-06-29"
"2019-06-30"
"2020-01-15"
"2019-12-31"