Date and Time

Link Site Notes
https://time.is/ Verify the time settting on your computer. Essestial for HF digital modes.
http://www.thinkman.com/dimension4/ Tool to automatically and accurately set your computer time. Essential for digital modes.
http://www.timebie.com/std/utc.php Calculate time zones.
https://www.timeanddate.com/ Outstanding and fun site for anything to do with dates and time.