isLeapYear
The isLeapYear function checks if a year or a date is a leap year.
Syntax
typescript
isLeapYear(yearOrDate: number | Date): boolean;Parameters
| Name | Type | Description |
|---|---|---|
yearOrDate | number | Date | The year (e.g., 2024) or a Date instance |
Returns
| Type | Description |
|---|---|
boolean | True if it is a leap year |
Examples
typescript
isLeapYear(2024);
// => true
isLeapYear(new Date("2020-01-01"));
// => true
isLeapYear(2023);
// => falseNotes
- Throws an error if the parameter is not a number or a valid date.
- Useful for date calculations and leap year validation.