1360. Number of Days Between Two Dates

Problem Link

Description

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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.

Solution

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Python3

class Solution:
    
    def daysBetweenDates(self, date1: str, date2: str) -> int:
        def f(date):
            y, m, d = map(int, date.split('-'))
            if m < 3:
                m += 12
                y -= 1
            return 365 * y + y // 4 + y // 400 - y // 100 + d + (153 * m + 8) // 5
        
        return abs(f(date1) - f(date2))