[1] ISO C 201X Proposal: Timezone Functions, David R. Tribble, 7/13/2022, 8:35:00 AM, 11/10/2011, 1:48:07 AM https://web.archive.org/web/20111110014755/http://david.tribble.com/text/c0xtimezone.html
[2] Modernized <time.h> API for ISO C, 7/13/2022, 8:35:39 AM, 10/8/2011, 12:58:52 AM https://web.archive.org/web/20111008005804/http://www.cl.cam.ac.uk/~mgk25/time/c/
Google search: time.h