Check Record Creation was 90 days ago or not and output record age (#2142)

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* Create checkdateover90.js

* README.md

* checkdateover90.js

Author: Soumyadeep10

Server-Side Components/Background Scripts/Check Record Creation over 90 days and output age/README.md

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+**Usecase**:
+This piece of code can be used to check whether a record was created more than 90 days ago or not.
+It returns an output of true/false as well as the actual age (in days) of the record.
+
+**Type**: 
+Background Script
+
+**How it works**:
+There is a pastDateString variable which can contain a date-time which you received by querying any particular record's sys_created_on field or any other relevant field. 
+In the actual code I have hard-coded a value to be used as an example.
+-There are two gliderecord objects to store the current date as well as past date
+-GlideDateTime.subtract() is used to calculate the time difference as a GlideDuration object
+-The time duration in milliseconds is converted to days by dividing with 86400000(milliseconds in a day)
+-Comparison is done between the results
+-The final age of the record and true/false result of the comparison is the output.
+[Note: Output may vary according to timezones]
+
+**Example**:
+pastDateString = 2025-05-01 10:00:00
+Output:
+
+    Record Age (Days): 165
+    Older than 90 days? true

Server-Side Components/Background Scripts/Check Record Creation over 90 days and output age/checkdateover90.js

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+//the pastDateString variable can contain a date-time which you received by querying any particular record's sys_created_on field or any other relevant field. Here I'm hard-coding a value.
+
+var pastDateString = '2025-05-01 10:00:00'; //input date and time
+var ageThresholdDays = 90;
+
+var gdtPast = new GlideDateTime(pastDateString);
+var gdtNow = new GlideDateTime();
+var duration = GlideDateTime.subtract(gdtPast, gdtNow);
+var durationMs = duration.getNumericValue();
+
+//Calculate the total days (1 day = 86,400,000 milliseconds)
+var totalDaysOld = Math.floor(durationMs / 86400000);
+
+var isOlderThanThreshold = false;
+if (totalDaysOld > ageThresholdDays) {
+    isOlderThanThreshold = true;
+}
+
+gs.info("Record Age (Days): " + totalDaysOld);
+gs.info("Older than " + ageThresholdDays + " days? " + isOlderThanThreshold);