alt Hacker News> It could be announced 50 years in advance.
Which is about how long it took for folks to switch from the Julian to the Gregorian calendar.
Replies
wmf • yesterday at 8:32 PM
In the US DST was changed in 2005 and the change went into effect in 2007.
It took much longer than that, although to be fair the Catholic countries had switched in much sooner than 50 years.