Get days difference action (ServiceNowDevProgram#743)

* Custom action to get the days difference between two dates.

* Description for "get days difference" flow action.

Author: shivamTodwal

Flow Actions/Get Days difference/getDaysDifference.js

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+// A custom flow action to get the days difference between two dates using GlideDateTime class.
+//Input variable of the action are startDate and endDate. Output variable is difference.
+(function execute(inputs, outputs) {
+    var startDate = new GlideDateTime(inputs.startDate);
+    var endDate = new GlideDateTime(inputs.endDate);
+    var startDateInMilliseconds = startDate.getNumericValue();
+    var endDateInMilliseconds = endDate.getNumericValue();
+    var timeDifference = endDateInMilliseconds - startDateInMilliseconds;
+    var daysDifference = Math.ceil(timeDifference / (1000 * 3600 * 24));
+    outputs.difference = daysDifference;
+})(inputs, outputs);

Flow Actions/Get Days difference/readme.md

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+# Get Days Difference
+Frequently, in our flow, there's a need to calculate the difference in days between two dates. To address this, I've developed a specialized flow action that facilitates this calculation.