Re: unix epoch data wrapping

[Ethan M. <merritt@u.washington.edu>]

On Saturday 27 March 2010, pl...@pi... wrote:

>>              /* In line with the current UNIX98 specification by
>>               * The Open Group and major Unix vendors,
>>               * two-digit years 69-99 refer to the 20th century, and
>>               * values in the range 00-68 refer to the 21st century.
>>               */
>> 
> OK, that is certainly the source of what is happening. That seems a 
> pretty arbitrary and dumb way to define behaviour that for no good 
> reason is based on the otherwise irrelevant unix year dot. Still that's 
> the way it is and it's outside of gnuplot. I'm curious as to whether 
> this works that same on windows which thinks the world was created in 
> 1980, not 1970.

Apparently MSWin (or at least Excel) uses a rule that
00-29 is a 21st century date, while  30-99 is a 20th century date.  
I have no idea what they are expecting to happen in 2030.