[gcab] gcab-file: fix wrong file modification day

[Marc-Andre Lureau <malureau src gnome org>]

commit 258e58715f404964a8417b2235431f565ae295e2
Author: Marc-André Lureau <marcandre lureau gmail com>
Date:   Thu Jul 30 23:45:28 2015 +0200

    gcab-file: fix wrong file modification day
    
    The day of the struct tm is not (0-30) but (1-31), no need to add +1!
    This fixes creation of cabinet file and MSI that Windows Installer
    rejects because of invalid date (29-02-2005 for ex).
    
    See bug:
    https://bugzilla.gnome.org/show_bug.cgi?id=753040

 libgcab/gcab-file.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libgcab/gcab-file.c b/libgcab/gcab-file.c
index d97539d..b55fbb5 100644
--- a/libgcab/gcab-file.c
+++ b/libgcab/gcab-file.c
@@ -142,7 +142,7 @@ gcab_file_update_info (GCabFile *self, GFileInfo *info)
     self->cfile.usize = g_file_info_get_size (info);
     self->cfile.fattr = GCAB_FILE_ATTRIBUTE_ARCH;
     self->cfile.date = ((m->tm_year + 1900 - 1980 ) << 9 ) +
-        ((m->tm_mon+1) << 5 ) + (m->tm_mday+1);
+        ((m->tm_mon+1) << 5 ) + (m->tm_mday);
     self->cfile.time = (m->tm_hour << 11) + (m->tm_min << 5) + (m->tm_sec / 2);
 
     return TRUE;