I tried this command line in command prompt for edit time SchTasks /Change /TN ReminderKontrak /ST 12:11 /RU EGGYSEggy and the result is success after I run cmd as administrator and enter the password..
and now I tried to implementation that to php code like this
shell_exec('SchTasks /Change /TN ReminderKontrak /ST 12:11 /RU EGGYSEggy');
but why the time not update and no error in browser?