mktime() failure vs 31-DEC-1969 23:59:59 GMT

[tomp at zk3.dec.com]

Hi Valery,

> My man page on mktime() (Solaris2) clearly says that 'tm_year
> of the tm structure must be for year 1970 or later.'

This would seem to limit the usefulness of timezone rules prior
to 1970 with respect to mktime().  Perhaps they did this for
standards compliance?

thanks,
- Tom