On Thu, Aug 27, 2015 at 12:25 PM, Stuart Bishop <[email protected]> wrote: > > I have billions of rows of data in my databases. If I'm dealing with > input from computer systems, such as my databases, I will have > billions of conversions to do and the overhead of calculating the fold > flag is billions of times worse than calculating the isdst flag from > the non-bulk human input.
Do you realize that a typical portable implementation of mktime calls localtime up to four times to get tm_isdst? And to get it completely "right", needs up to six calls? [1] I am sure I can do no worse than that computing the fold value. [1]: "BUG in mktime" https://www.sourceware.org/ml/libc-hacker/1998-10/msg00027.html
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