If you don't adjust for DST and what part of your timezone you are in it will be off by something like 30 degrees. If you need better than that the adjustments are not very hard (The 80/20 in most places being to just subtract one hour from what the clock shows because of DST).
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.