On Sat, Oct 8, 2016, at 15:46, Carsten Larsen wrote:
The actual time is is number of seconds since 1.1.1978 and possibly a GMT offset (if the user have bothered to set it. The system does not take it into consideration). There is no concept of daylight saving rules and no concept of UTC.
So does AmigaOS not ship with a standard C library with its own time.h functions? Even if they only handle one system-defined timezone, seeing which of localtime/gmtime gives 1978-01-01 00:00:00 when you pass in a value of 0 would be useful.
I guess I need to determine the exact point of January 1, 1970, 00:00:00 *UTC* on my (AmigaOS) timeline in order to use the time.h functions in tz, and I assume the TZ variable and tz code can help me to do so. Right ?
You need to figure out how the system's native functions handle it. Also http://distributed.amiga.org/misc/timezone.text may be useful. Maybe look at what this "ixemul" thing does. The version at http://www.nic.funet.fi/index/gnu/funet/historical-funet-gnu-area-from-early... appears to treat it as UTC - from gettimeofday.c: __time_req->tr_node.io_Command = TR_GETSYSTIME; omask = syscall (SYS_sigsetmask, ~0); DoIO((struct IORequest *)__time_req); syscall (SYS_sigsetmask, omask); *tp = __time_req->tr_time; /* add the offset from unix to amigados time system */ tp->tv_sec += (8*365+2) * 24 * 3600;