Should probably clarify that my comments regarding the code for timezone handling refers to the glibc implementation of timezone handling and glibc implmenetaiton of tzset(). After checking your code I see that your implementation varies from the one in glibc and so my question should probably be directed to glibc rather than at your tz package. Hope this clarifies my earlier comments. My questions are still such that I would like answers to them. How much work would it be to make an implementation that did something along the lines as described in my earlier mail? Looking at your code you appear to have a struct state that appear to contain the data which I described in my timezone_t type. Is that a correct understanding or are their details here that I have misunderstood? Alf