Add method to set schedule script start time in reports

Currently after a clock change we need to manually adjust all of our scheduled script times. In the script properties object there are a few methods available to retrieve the start time and other properties. Most properties also have a "set" method available for them, however the start time does not have "set" method available. It would be nice to be able to write a script to adjust the start times without needing to manually do it one by one.