Moved calculation to actually change lastcron into its own function.
Changed validation errormessage to run: if ( dayStart != Math.floor(dayStart) || dayStart < 0 || dayStart > 24 ) {error message}.
Created new calculation for daystart because daystart could never be
future to the current timestamp. This "fix" has broken the whole endeavor,
though, because cron runs immedately when newlastcron > now and now >
oldlastcron.
carolstone
9fe96b7f94