2 * linux/fs/isofs/util.c
8 * We have to convert from a MM/DD/YY format to the Unix ctime format.
9 * We have to take into account leap years and all of that good stuff.
10 * Unfortunately, the kernel does not have the information on hand to
11 * take into account daylight savings time, but it shouldn't matter.
12 * The time stored should be localtime (with or without DST in effect),
13 * and the timezone offset should hold the offset required to get back
14 * to GMT. Thus we should always be correct.
17 int iso_date(char * p
, int flag
)
19 int year
, month
, day
, hour
, minute
, second
, tz
;
28 if (flag
== 0) tz
= p
[6]; /* High sierra has no time zone */
34 int monlen
[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
39 for (i
= 1; i
< month
; i
++)
41 if (((year
+2) % 4) == 0 && month
> 2)
44 crtime
= ((((days
* 24) + hour
) * 60 + minute
) * 60)
52 * The timezone offset is unreliable on some disks,
53 * so we make a sanity check. In no case is it ever
54 * more than 13 hours from GMT, which is 52*15min.
55 * The time is always stored in localtime with the
56 * timezone offset being what get added to GMT to
57 * get to localtime. Thus we need to subtract the offset
58 * to get to true GMT, which is what we store the time
59 * as internally. On the local system, the user may set
60 * their timezone any way they wish, of course, so GMT
61 * gets converted back to localtime on the receiving
64 * NOTE: mkisofs in versions prior to mkisofs-1.10 had
65 * the sign wrong on the timezone offset. This has now
66 * been corrected there too, but if you are getting screwy
67 * results this may be the explanation. If enough people
68 * complain, a user configuration option could be added
69 * to add the timezone offset in with the wrong sign
70 * for 'compatibility' with older discs, but I cannot see how
71 * it will matter that much.
73 * Thanks to kuhlmav@elec.canterbury.ac.nz (Volker Kuhlmann)
74 * for pointing out the sign error.
76 if (-52 <= tz
&& tz
<= 52)
77 crtime
-= tz
* 15 * 60;
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