Today is April 4, 2004, most areas of US, on local time 2:00am DST (daylight savings time) started, for instance, at NYC today, just 1 second after 01:59:59 EST(-0500 UTC) was 03:00:00 EDT(-0400 UTC). But our server located in Arizona, where don't have daylight savings time, still use Standard Time, MST(-0700 UTC).

Even now, most businessperson still feel confused about the DST and time zone differences, I had to inform them occasionally, but it somehow complicated...

DST stands for Daylight Saving Time, also referred to as Summer Time. Daylight Saving Time is used in many locations around the world as a time adjustment to local clocks, hoping to take greater advantage of available natural light during the summer months. But not all areas started at the same time, in fact in Europe and Russia DST started last week on March 28, 2004.