Time and Date: Manipulate date and time Gerardo Miguel Ballena Descalzo (contact me)
This is a siple class that can be used to perform arithmetic operations with dates.
It can add or subtract a period in years, months, days, hours, minutes and seconds to a given date or a time.
The code and comments are in Spanish.
In Spanish:
Esta clase te permite aumentar y disminuir la fecha y hora, y obtener una cadena con la fecha segun un formato ingresado (Use como base cdate).
Php Handleiding