Hmm...that should work, I ran a similar script in test instance of mine and it logs out fine. At any rate, I think the larger issue is with the state setting, this is failing due to the way you are setting the created date from task.sys_created_on. You can't do this with a direct assignment (created = task.sys_created_on), you need use the setValue method of GlideDate. This is causing the date to not be set correctly and created stays set to the current date time when the object is created.
Try the following, I broke up the log statements so we can see what the dates are right before the dayLimit > created check and the state after it is set in the conditional.
iDate();
function iDate(){
var dayLimit = new GlideDate();
var created = new GlideDate();
var task = new GlideRecord('sc_task');
task.addQuery('request_item', current.sys_id);
task.addQuery('state', 1);
task.query();
created.setValue(task.sys_created_on);
created.addDaysUTC(15);
gs.log('RFS created ' + created.getValue(), 'RFS query');
gs.log('Day Limit ' + dayLimit.getValue(), 'RFS query');
if (task.next()) {
if(dayLimit>created){
task.state = 2;
gs.log('In day limit check, setting state to ' + task.getValue('state'));
}
task.update();
}
var str = 'RFS created date: ' + created.getValue() + '\n';
str += 'Day Limit: ' + dayLimit + '\n';
str += 'Task State: ' + task.state;
gs.log (str,'RFS query');
}
