With this function you can increment a given datetime value by a specific number of days, and it will return the new datetime value.
date_inc_day(date, amount);
| Argument | Type | Description | 
|---|---|---|
| date | Datetime | The datetime to add to. | 
| amount | Real | The number of days (must be an integer) to add. | 
mynewdatetime = date_inc_day(date_current_datetime(), 365);
This would set "mynewdatetime" to the current date but with 365 days added.