YES, it does! These other reviewers just don't know how it works, lol.
To adjust the display brightness, with the alarm turned off press the snooze bar several times and it will toggle between bright and dim.
(Each time you press it it will show the alarm or sleep time but ignore that. It does dim or brighten after several presses)
Not sure what your question is, but if you are having trouble with the clock adjusting back to Standard time, check the month/day/year settings. Press DST button till it beeps and you see Auto, then OFF. Press clock button till it beeps. It shows a 2-digit number for the year. If it's not on the right year, use the plus-minus arrows to change it. Then press clock again. The month appears. If it's not the current month, again use the arrows to set it. Then repeat for the day. Once you are back to the time setting on the clock, press the DST button again till you see Auto-ON. The clock will update to standard time.
Mine came set from the factory. All I had to do was adjust for time zone, and there's a button on top of the clock for that. But if you really have to reset the time, press and hold the button on top of the clock labeled "Clock" until the display starts blinking. The first thing to set is the year. Press either the + button or the - button until you get 14. Press the "Clock" button again. The month and date blink. Use the same + and - buttons to set it. Press the "Clock" button again. The time blinks. Once more, use the + and - buttons to set the current time. Pretty easy!!