Where trigger the “Please enter a valid date.” in jquery.validate.js
问题 I am using jQuery UI version 1.12.1 and jQuery Validation v1.15.0 I created a datepicker as follow: if ($.fn.datepicker) $(':input.date').datepicker({ changeMonth: true, changeYear: true }); By default, the date format will be mm/dd/yyyy, for example 01/26/2017, represent 26th January 2017. I am trying to change the date format to be dd/mm/yyyy, so I change the datepicker as follow: if ($.fn.datepicker) $(':input.date').datepicker({ changeMonth: true, changeYear: true, dateFormat: 'dd/mm/yy'