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Tcl_MakeSafe needs to be aware that [clock] may need special
handling. (It appears unlikely that such code actually exists.)
+ One incompatibility of note is that if the time zone cannot
+ be determined from the TZ, TCL_TZ environment variables, or
+ from the Windows control panel, so that the C library must be
+ used for date and time conversions, then times outside the
+ range of time_t will fail; they used to return bad data silently.
+
Many thanks to all the many people who assisted with testing,
debugging, criticism of the specification, and localisation.
Deserving of particular mention are Joe English, Clif Flynt, Donal