How to convert Date in Human Readable Format?

Constants for expressing human-readable intervals in their respective number of seconds.

define( ‘MINUTE_IN_SECONDS’, 60 );
define( ‘HOUR_IN_SECONDS’, 60 * MINUTE_IN_SECONDS );
define( ‘DAY_IN_SECONDS’, 24 * HOUR_IN_SECONDS );
define( ‘WEEK_IN_SECONDS’, 7 * DAY_IN_SECONDS );
define( ‘YEAR_IN_SECONDS’, 365 * DAY_IN_SECONDS );