Let's say we wanted to turn it into a gradient where we instead shifted five minutes per night, so we need 12 days to transition an hour. You could just add a

Let's say we wanted to turn it into a gradient where we instead shifted five minutes per night, so we need 12 days to transition an hour. You could just add a transition countdown field "-" to the "S" and "D" timezones being transitioned to, dropping it once the transition is finished. e.g. for Pacific time: PST -> PD-12T -> PD-11T -> PD-10T ... PD-1T -> PDT and in reverse: PDT -> PS-12T -> PS-11T -> PS-10T ... PS-1T -> PST If you already have the indirection of the table, it doesn't increase implementation complexity to put some more rows in it. I don't see where you got 365 zones per time zone, unless you thought I was proposing we change the time a little bit every single day of the year. That's entirely unnecessary to eliminate the practical nuisance of the sudden 1-hour jump.