Added snippet: Calculate date difference in days

Server-Side Components/GlideDateTime/DateCalculations/DateDifference/README.md

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+# Date Difference Snippet
+
+**Author:** Harish  
+**Category:** GlideDateTime / Date Calculations  
+**Use Case:** Calculate the difference in days between two date/time values.
+
+## Description
+This snippet uses `GlideDateTime` and `gs.dateDiff()` to calculate the number of days between two given date/time strings.
+
+## Example
+```js
+gs.info(getDateDifferenceInDays('2025-10-01 00:00:00', '2025-10-16 00:00:00'));

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

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+// 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'));

Server-Side Components/harishk_DateDifferenceSnippet.js

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+// 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'));