Current date script appears much older to some users

The custom calculation script shown below is working for some users and then not for others. When it's wrong, it's REALLY wrong (like 11 months off) and the font doesn't even appear correctly. So far the 2 users who reported the issue use a Microsoft Surface. Could this be the problem or is it something else? Thanks for your time.

var f = this.getField("Today");

f.value =

util.printd("dddd, mmmm d, yyyy.", new

Date());

Rachelle