/**
 * External dependencies
 */
import { WEEK } from '@woocommerce/data';

export function getStoreAgeInWeeks( adminInstallTimestamp: number ) {
	if ( adminInstallTimestamp === 0 ) {
		return null;
	}

	// Date.now() is ms since Unix epoch, adminInstallTimestamp is in
	// seconds since Unix epoch.
	const storeAgeInMs = Date.now() - adminInstallTimestamp * 1000;
	const storeAgeInWeeks = Math.round( storeAgeInMs / WEEK );

	return storeAgeInWeeks;
}