tde@electrictime.com said: > In the suburb of Boston where we are located - you never have to correct an > electrical clock between the daylight saving time changes. This of course > assumes you haven't lost power - due to major snow storms etc.... I agree with the spirit of your comment, but since this is time-nuts... My experience, west coast: Over a month, the time is often within a 10 second band. Over a day, the time is often within a 5 second band. There are occasional times when it slews 50 seconds over a month. http://users.megapathdsl.net/~hmurray/time-nuts/line/Calif-60Hz-2014-2015.png http://users.megapathdsl.net/~hmurray/time-nuts/line/Calif-60Hz-2015-Jul.png -- These are my opinions. I hate spam.