任何时区的用户都在太平洋时间输入日期

OK maybe I'm being exceptionally dense about this... but I'm wondering how I can make it so that users worldwide in any time zone who use a time picker to enter a time in Pacific Time, and then see it printed back to them in Pacific Time (either PST or PDT, depending) after save. Let's take the example of someone in New York. I'm thinking the flow should be like this:OK maybe I'm being exceptionally dense about th