NSCalendarDate -> UTCDateTime
NSCalendarDate -> UTCDateTime
- Subject: NSCalendarDate -> UTCDateTime
- From: Matt Ronge <email@hidden>
- Date: Tue, 30 Apr 2002 19:42:30 -0500
I've been working with getting and setting file dates.
For example I have a number of methods like these:
- (NSDate *)creationDate
{
FSCatalogInfo catalogInfo;
OSErr err;
FSRef tempRef;
NSTimeInterval seconds;
//An epoch is the start of carbon time
NSCalendarDate *epoch = [self epoch];
tempRef = [self getFSRef];
err = FSGetCatalogInfo(&tempRef, kFSCatInfoCreateDate, &catalogInfo,
NULL, NULL, NULL);
seconds = (double)((unsigned long
long)catalogInfo.createDate.highSeconds << 32) +
(double)catalogInfo.createDate.lowSeconds +
(double)catalogInfo.createDate.fraction / 0xffff;
return [epoch addTimeInterval:seconds];
}
//Returns Epoch for use in date methods
- (NSCalendarDate *)epoch;
{
return [NSCalendarDate dateWithYear:1904 month:1 day:1 hour:0 minute:0
second:0 timeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
}
A large section of it I got from an earlier post on this list. However, I
now need to set these attributes. Except I have no idea how to turn a
NSCalendarDate into a UTCDateTime struct. I've looked for a specification
for UTCDateTime, but there are none that explain the usages of the members
of the struct. So I can't really "reverse engineer" the code that turns the
struct into the seconds variable that I grabbed from the list.
Please point out in errors I have in my implementation above!
Thanks,
--
Matt Ronge
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