gw-preserve-datepicker-date-selection-when-changing-months.js: Fixed an issue with edge cases like 29 February, 31 April etc.

Author: saifsultanc

gravity-forms/gw-preserve-datepicker-date-selection-when-changing-months.js

@@ -18,9 +18,28 @@ gform.addFilter( 'gform_datepicker_options_pre_init', function( optionsObj, form
 		var selectedDate = $(this).datepicker('getDate');
 		var day = selectedDate ? selectedDate.getDate() : 1;
 
-		// Set the new date with the updated month and year
+		// Helper function to check if the given year is a leap year
+		const isLeapYear = year => new Date(year, 1, 29).getMonth() === 1;
+
+		// Determine the maximum days for the selected month
+		let maxDay;
+		if (month === 2) {
+			// February
+			maxDay = isLeapYear(year) ? 29 : 28;
+		} else if ([4, 6, 9, 11].includes(month)) {
+			// April, June, September, November
+			maxDay = 30;
+		} else {
+			// All other months
+			maxDay = 31;
+		}
+
+		// Adjust the day if it exceeds the maximum days in the selected month
+		day = Math.min(day, maxDay);
+
+		// Set the new date with the updated month, year, and adjusted day
 		$(this).datepicker('setDate', new Date(year, month - 1, day));
 	}
-  
-    return optionsObj;
+
+	return optionsObj;
 } );