Leap Year Listing | Dataford Interview Questions

MORSE replay and simulation tooling may need to validate timestamps against the Gregorian calendar. Given an ending year, return every leap year from 1582 through that year, inclusive.

A year is a leap year if it is divisible by 400, or if it is divisible by 4 but not by 100. Use the proleptic Gregorian rules for all years in the requested range.

Formal Specification

Implement leap_years(end_year), where end_year is an integer. Return a list of integers in ascending order. The range starts at 1582 and includes end_year. The caller supplies the current year explicitly so the function is deterministic and easy to test.

Constraints

1582 <= end_year <= 10^9
Return an empty list if end_year is before 1584
Use integer arithmetic only

Function Signature

def leap_years(end_year):

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