(RADIATOR) Expiration

[Radius Admin]

I am trying to update an EXPIRATION field which is a date field in my users database.   I am trying to use the following statement.   AcctSQLStatement update USERS set EXPIRATION=%t+7776000 where.......   Is there anyway for me to format the value of "%t+7776000" to a format which is acceptable to mysql date format.   Thanks