Function getHours

getHours(date: number | Date): number
Get the hours of the given date.

This function validates arguments before processing and returns the hours (0-23) of the given date in 24-hour format. Returns NaN for invalid input.
Parameters
- date: number | Date
  The base date as a Date object or timestamp (number)
Returns number
The hours as a number (0-23), or NaN if invalid
Example
```
// Get hours from Date object
const result = getHours(new Date(2025, 0, 15, 14, 30));
// Returns: 14

// Get hours from timestamp
const result2 = getHours(1704110400000); // 2024-01-01 12:00:00
// Returns: 12

// Midnight (start of day)
const result3 = getHours(new Date(2024, 0, 1, 0, 0, 0));
// Returns: 0

// End of day
const result4 = getHours(new Date(2024, 0, 1, 23, 59, 59));
// Returns: 23

// Invalid date returns NaN
const result5 = getHours(new Date("invalid"));
// Returns: NaN
```
Remarks
- Validates arguments before conversion (consistent with library patterns)
- Accepts both Date objects and numeric timestamps
- Returns NaN for: Invalid Date, NaN, Infinity, -Infinity
- Returns the hours in the local timezone (not UTC)
- Hours are in 24-hour format (0-23)
- Defined in getHours/index.ts:42