Add date difference calculation function

This script calculates the difference in days between two dates using GlideDateTime.

Author: harishkSN

Server-Side Components/GlideDateTime/DateCalculations/DateDifference/harishk_DateDifferenceSnippet.js

@@ -0,0 +1,18 @@
+// Author: Harish Kothandapani
+// Purpose: Calculate difference in days between two dates
+
+function getDateDifferenceInDays(startDate, endDate) {
+  try {
+    var gdtStart = new GlideDateTime(startDate);
+    var gdtEnd = new GlideDateTime(endDate);
+    var diff = gs.dateDiff(gdtStart.getDisplayValue(), gdtEnd.getDisplayValue(), true);
+    // gs.dateDiff returns seconds when third param = true
+    return Math.floor(diff / (60 * 60 * 24)); // convert seconds to days
+  } catch (e) {
+    gs.error('Error calculating date difference: ' + e.message);
+    return null;
+  }
+}
+
+// Example usage:
+// gs.info(getDateDifferenceInDays('2025-10-01 00:00:00', '2025-10-16 00:00:00'));