Problem Brief

Days Since Last Login 🐠

INTERNOA

At Alarm.com we need a new piece of functionality that will tell us how many days it's been since a user last logged into our site. Our product manager has given us the following requirements that they would like implemented so that we can start tracking inactive users.

Minimally Viable Product

Input should be a string in the format "MM/dd/yyyy"

The input should be converted to a date and subtracted from today's date

Return the absolute whole number of days as a string

Things to consider

If the input does not contain any characters or is only whitespace then return error code "E8430"

If the input is in the wrong format return error code "E9021"

If the input is in the correct format but not a valid date then return error code "E1756"

1Example 1

Input

lastLoginDate = "07/06/2022"

Output

"1"

Explanation

Input = "07/06/2022" Today = 07/07/2022 Output = "1"

2Example 2

Input

lastLoginDate = "02/30/2020"

Output

"E1756"

Explanation

The input "02/30/2020" is in the correct format but not a valid date because February does not have 30 days. Therefore, the function returns the error code "E1756". (By Tomtato. If you find it wrong, pls lmk! THX 🩵!)

Constraints

Limits and guarantees your solution can rely on.

Unknown for now..

Draft autosaves locally

public String daysSinceLastLogin(String lastLoginDate) {
  // write your code here
}

Input

lastLoginDate

"07/06/2022"

Output

"1"