Flow Designer Update Record script returns different value than background script

[Brad59]

I need a scheduled manner to return seconds from epoch. getNumericValue returns milliseconds. Whenever I take any math actions on the return of getNumericValue, the Flow Designer outputs the value in scientific notation. 

If I run the very simple code below in a background script (developer toolkit). It returns the appropriate integer value (1643903153). If I run the same code in a Flow Designer Update Record Field Value script it returns in scientific notation (1.643903153E9). I have tried a variety of ways to resolve this but have been unsuccessful so far. Do anyone have an explanation or way to resolve?

I have tried using the Number() function as well as using the toFixed function that I have seen on Stackoverflow. I will be attempting to convert the return of getNumericValue to a string, truncating it, then converting it back to a number. Another option is to just use a Scheduled Job but I'm not quite there yet.

// Backgroun script
var gdt = new GlideDateTime();
var now = gdt.getNumericValue();
now = Math.round(now / 1000);
gs.print(now);
// now == 1643903153

// Flow designer
var gdt = new GlideDateTime();
var now = gdt.getNumericValue();
now = Math.round(now / 1000);
return now;
// now == 1.643903153E9

[Brad59 · Accepted solution]

This was a rookie mistake on my part. The field type I was saving this to was a string so the below code solved my issue.

var gdt = new GlideDateTime();
var now = gdt.getNumericValue();
now = now.toString();
now = now.slice(0, -3);
return now;