Inbound Email Action: Converting dates are returning undefined

[mythNOW]

Hello ServiceNow community,

Currently, I am trying to convert a date from a subject email so that it reads correctly in the Change module Start date. The date in the email is structured as M/D/YYYY @ HH:MM PM/AM.  For my use case, I have been assigned to work on an existing script, and edited the script accordingly attempting so the date is formatted to match the Change Record start date (MM-DD-YYYY).  Yet when attempting to use padStart, and ensuring the values of month and day are string value, I receive an undefined result when looking at the message logs.  Here is the script:

// Extract Start Date/Time (the (.*?) grabs the date and time. Typical result is i.e 5/18/2024 @ 08:00 PM)

    var stReg = /Start Date\/Time:(.*?)End Date\/Time/gi;

    var startDateTime = stReg.exec(htmlcode)[1]; // Ensure there's a match

    var ogDateTime = startDateTime.trim(); // Clean up leading/trailing spaces

    gs.info('CDT extracted start date' + ogDateTime);

    // Split into date and time parts (split date and time as two elements)

    var startDateParts = ogDateTime.split(" @ ");

    gs.info('CDT split date/time:' + startDateParts);

    if (startDateParts.length !== 2) {

        gs.info("Error splitting date/time");

        return; // Exit if split fails

    }

    // Reformat date to MM-DD-YYYY

    var datepart1 = startDateParts[0].trim();

    gs.info('CDT date parts trimmed:' + datepart1);

    var dateComponents = datepart1.split("/");

    gs.info('CDT date parts split' + dateComponents); //Dates should split M,D,Y

    if (dateComponents.length !== 3) {

        gs.info("Error splitting date components");

        return; // Exit if split fails

    }

    var monthArray = dateComponents[0];

    gs.log('CDT start month' + monthArray);

    var monthString = String(monthArray);

    gs.info('CDT month string value ' + monthString);

    var paddedMonth = monthString.padStart(2, '0');

    gs.log('CDT start month padded ' + paddedMonth);

    var dayArray = dateComponents[1];

    var dayString = String(dayArray);

    var paddedDay = dayString.padStart(2, '0');

    gs.log('CDT start day padded ' + paddedDay);

    var year = dateComponents[2]; // Year should be 4 digits

    var formattedDate = [paddedMonth, paddedDay, year].join("-");

    gs.info("CDT formatted date:" + formattedDate);

When looking at the message logs for gs.info('CDT month string value ' + monthString); it reads 5 in this example. This is the desired result.  

But when using:

var paddedMonth = monthString.padStart(2, '0');

I am always receiving undefined.  I am hoping to achieve a result of "05".

Is there any type of correction I can make with my script? Thank you everyone.