Adds a date
Parameter 1: The TIMESTAMP date format. The TIMESTAMP is obtained from the following values:
Static value
Dynamic value
get_current_date function
Parameter 2: The static time value in milliseconds that is added. This is obtained from an object that yields a number.
Returns: A date and time in the TIMESTAMPdate format, which is: yyyy-mm-dd hh:mm:ss.sss.
For example: 2012-01-09 04:55.14.000