I’m trying to write a C++ wrapper for the timezone database.

I have run ZIC to convert the data to binary files and know where these are. Now I’m having a look at zdump because, when I’m done, I want to convert UTC to a time zone of my choice.

Problem is when I run zdump it never seems to return anything different. E.g.,

thom@hehl /cygdrive/c/javatools/tzinfo/src

$ ./zdump America/Anchorage

America/Anchorage  Mon Oct 24 19:46:24 2011 GMT

thom@hehl /cygdrive/c/javatools/tzinfo/src

$ ./zdump America/Chicago

America/Chicago  Mon Oct 24 19:46:34 2011 GMT

thom@hehl /cygdrive/c/javatools/tzinfo/src

$ ./zdump America/Kentucky/Louiville

America/Kentucky/Louiville  Mon Oct 24 19:48:21 2011 GMT

My clock is current set to Eastern Daylight.

Thanks.