valueProcess.js

import("system.vars");
import("system.result");
import("system.neon");
import("Date_lib");

if(vars.get("$sys.recordstate") == neon.OPERATINGSTATE_NEW && vars.get("$this.value") == "")
{
    result.string(DateUtils.getTodayUTC());
}
else
    result.string(vars.get("$this.value"));