Date Range Validations (#2568)

* README.md

* dateRangeValidation.js

* Update README.md

Author: prudvi-sai-posetty

Client-Side Components/Client Scripts/Date Range Validation (Within 30 Days)/README.md

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+Date Range Validation (Within 30 Days) in Client Side
+
+This ServiceNow client script provides real-time date validation for form fields, ensuring users can only select dates within a specific 30-day window from today's date. The script runs automatically when a user changes a date field value, providing immediate feedback and preventing invalid date submissions.
+
+The script validates that any date entered in a form field meets these criteria:
+Minimum Date: Today's date (no past dates allowed)
+Maximum Date: 30 days from today's date
+Real-time Validation: Instant feedback as users type or select dates
+User-friendly Errors: Clear error messages explaining the valid date range
+Automatic Field Clearing: Invalid dates are automatically cleared to prevent submission

Client-Side Components/Client Scripts/Date Range Validation (Within 30 Days)/dateRangeValidation.js

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+function onChange(control, oldValue, newValue, isLoading, isTemplate) {
+    if (isLoading || newValue === '') {
+        return;
+    }
+    
+    var todayDate = new Date();
+    var futureDate = new Date();
+    futureDate.setDate(futureDate.getDate() + 30);
+    
+    var todayDateStr = formatDate(todayDate, g_user_date_format);
+    var futureDateStr = formatDate(futureDate, g_user_date_format);
+    
+    var selectedDateNum = getDateFromFormat(newValue, g_user_date_format);
+    var todayDateNum = getDateFromFormat(todayDateStr, g_user_date_format);
+    var futureDateNum = getDateFromFormat(futureDateStr, g_user_date_format);
+    
+    if (selectedDateNum < todayDateNum || selectedDateNum > futureDateNum) {
+        g_form.showFieldMsg(control, 'Date must be between today and 30 days from today', 'error');
+        g_form.clearValue(control);
+    } else {
+        g_form.hideFieldMsg(control);
+    }
+}