exception 'Exception' with message '"first  of 2025-9" is not a valid strtotime' in /home/ngaydep.com/public_html/libraries/system/FunctionLib.php:3405
Stack trace:
#0 /home/ngaydep.com/public_html/modules/calendar/Calendar.php(4972): FunctionLib::getAllDaysInAMonth('2025', 9, NULL)
#1 /home/ngaydep.com/public_html/libraries/controller/Controller.php(101): Calendar->demthu()
#2 /home/ngaydep.com/public_html/index.php(161): Controller->dispatcher()
#3 {main}message