Re: calendar gets wrong end for Daylight Savings Time

[Glenn Morris]

Eli Zaretskii wrote:

>> I would assume that M-x calendar must use the database directly to
>> find out _when_ DST starts and ends to print the calendar correctly.
>
> It can do that, but it doesn't have to: it could alternatively pass
> the corresponding time_t value to the time routines and get the DST
> flag back as the result.  The Lisp primitives that return the current
> time or time string should support that already.

Am I totally missing the point here? The question to be answered is:
what day of the year does Daylight Saving Time start/end? This is so
it can be printed as a diary/holiday entry, eg so people know when to
change their clocks. How do I do find that date in your method?