<<I use TZ = NZST-12NZDT but that seems to put the time one hour out during daylight saving time.>> This might be an RC issue; it could be more than a coincidence that the NZ time zone in TZTAB is the only one that uses a "-13" value. In fact, the TZTAB entry for NZ looks odd even ignoring the "-13" value: # New Zealand Standard Time, New Zealand Daylight Time # NZST-12NZDT 0 3 25-31 10 1985-1988 0 NZDT-13 0 3 8 10 1989 0-6 NZDT-13 0 3 1-7 10 1990-1999 0 NZDT-13 0 1 1-7 3 1985-1989 0 NZST-12 0 1 15-21 3 1990-2038 0 NZST-12 Has NZ decided to discontinue the switch to DST after 1999? With this TZTAB entry, there won't be an automatic switch to DST in or after 2000. Steve