Add the specified number of days to this datetime.
Add the specified number of days to the value of this object. Return a reference providing modifiable access to this object. The behavior is undefined unless the resulting value is in the valid range for a Datetime object. Note that this method has no effect on the "time" part of this object. Also note that days may be positive, 0, or negative.
reference to this object
| Name | Description |
|---|---|
| days | number of days to add (may be negative) |