$timestamp = TikiLib::make_time(date('Y-m-d H:i:s'));
$timestamp = TikiLib::make_time('2022-01-01 12:00:00');
$timestamp = TikiLib::make_time('2022-01-01 12:00:00', 'UTC+8');In these examples, TikiLib is the package library and make_time is the function provided by TikiLib to create a Unix timestamp based on a date and time.