[Zlib-devel] DosDate and Year 1980

[Baird, David]

Hi,

The zip packages produced by Office 2007 use a Dos Date of 1/1/1980 (=0)
for all the parts of the zip file -lazy programmers, you would expect
better from MS.
When processing these dates to a new zip file, the current 
ziplocal_TmzDateToDosDate(const tm_zip* ptm, uLong dosDate) function
produces a year of 2088 for 1980, as it does not subtract 1980 from the
year
1980. To fix this, I changed the code in zip.c for
ziplocal_TmzDateToDosDate
from:
    if (year>1980)
        year-=1980;
    else if (year>80)
        year-=80;
to:
    if (year>=1980)
        year-=1980;
    else if (year>=80)
        year-=80;

Regards,
David
_________________________________________________________
Dr David Baird, Biometrician  EMail:  David.Baird at AgResearch.CO.NZ
Mail: AgResearch, PO Box 60, Gerald St, Lincoln, NEW ZEALAND
Phone: +64 3 325 9975   Fax: +64 3 325 9946
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