Just wanted to make sure you weren't already doing something extra that I was about to undo. This should do that:
(function executeRule(current, previous /*null when async*/ ) {
var gr = new GlideRecord('sc_task');
gr.addQuery('request_item', current.request_item);
gr.query();
while (gr.next()) {
var comment = current.comments.getJournalEntry(-1);
var usrstrt = comment.indexOf(" - ");
var usrend = comment.indexOf(" (Additional");
var usrname = comment.substring(usrstrt+3, usrend); //isolate the user Name
var usrGr = new GlideRecord('sys_user');
if (usrGr.get('name', usrname)) {
var tz = '"' + usrGr.time_zone + '"';
comment = comment.replace(' - ', ' ' + tz + ' - '); //update the comment with "author's timezone"
}
gr.comments = comment;
gr.update();
}
})(current, previous);
