Convert Time to Milliseconds

This TypeScript utility provides a clean, type-safe way to convert human-readable time values (hours, minutes, seconds) into milliseconds. It uses TypeScript's type system to enforce proper parameter structure and offers default values for optional parameters. The function is particularly useful for applications that require precise timing calculations, such as animations, timers, scheduled operations, or API request timeouts. The utility follows functional programming principles and includes a practical usage example.

type Time = {
	hours?: number
	minutes?: number
	seconds?: number
}
 
function convertToMilliseconds({
	hours = 0,
	minutes = 0,
	seconds = 0,
}: Time): number {
	const MS_PER_SECOND = 1000
	const MS_PER_MINUTE = 60 * MS_PER_SECOND
	const MS_PER_HOUR = 60 * MS_PER_MINUTE
 
	return hours * MS_PER_HOUR + minutes * MS_PER_MINUTE + seconds * MS_PER_SECOND
}
 
const time = { hours: 1, minutes: 30, seconds: 45 }
const milliseconds = convertToMilliseconds(time)
console.log(milliseconds) // 5445000