Release Time Fence to be defined as start and end dates instead of enter user defined days

Hi,

We have a following requirement:

There are set of items which have a start date and end date for being released from workbench. Currently we have defined a release time fence of User defined = 1 day. By this the item will be released from workbench on a daily basis if need be.

Sometimes, if the planner does not go and update the item attribute and if there is a forecast defined in the system, this triggers a release even after the end date of the item.

So to prevent the items not being released after the end date is there a way to enter a start date and end date for release time fence in oracle R12? (Ver: 12.1.3)