Re: NSLog displays inconsistent format for NSDate
Use an NSDateFormatter. Use a format string with at the end ZZZ or if you
want the time zone offset added.
> On Aug 20, 2019, at 2:50 PM, Carl Hoefs via Cocoa-dev
> wrote:
>
> When printing out an NSDate using NSLog from within Xcode I get:
>
> "Tue Aug 20 12:32:40 2019"
>
> When the same program is run from within a shell (bash) window:
>
> "2019-08-20 19:32:48 +"
>
> Is the NSDate output format somehow determined by the environment? My system
> is set to Local Time Zone (America/Los_Angeles (PDT) offset -25200
> (Daylight)).
>
> A code snippet that reproduces the issue follows.
>
> -Carl
>
>
>
> - (void) testDate
> {
>NSCalendar *calendar = [NSCalendar currentCalendar];
>unsigned unitFlags =
> NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitTimeZone;
>NSDateComponents *dateComponents = [calendar components:unitFlags
> fromDate:[NSDate date]];
>dateComponents.timeZone = NSTimeZone.localTimeZone;
>NSDate *configuredDate = [calendar dateFromComponents:dateComponents];
>NSLog(@"Configured date: %@",configuredDate);
> }
>
> Xcode:
> 2019-08-20 12:32:40.828863-0700 tester[3926:1353] Configured date: Tue Aug 20
> 12:32:40 2019
>
> Shell:
> 2019-08-20 12:33:08.356 tester[3928:1359] Configured date: 2019-08-20
> 19:32:48 +
>
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Re: NSLog displays inconsistent format for NSDate
> On Aug 31, 2019, at 2:51 AM, Allan Odgaard via Cocoa-dev > wrote: > > On 31 Aug 2019, at 2:49, Carl Hoefs via Cocoa-dev wrote: > >> Same result if I run it as a system daemon. So as you suggest it seems there >> could be some sort of environment sensitivity going on. If only I knew what >> env var to set in the shell... UTC really isn't what I'm looking for. > > The issue appears to be that `NSLog` sends your format string and arguments > to the unified logging system, this is what Xcode and Console displays, and > here you get dates formatted using the local time zone. > > But it *also* does a simple `stringWithFormat:` and sends the result to > standard error, at least when running in a terminal. This is where you are > seeing a more crude formatting of the date which is not adjusted to the local > time zone. > > Open a new tab in your terminal, in that tab run this command: > > log stream|grep 'Configured date' > > Now run your executable, and in the tab where it is running, you should see > the UTC date, but in the tab where you are watching the log stream, you get > the local date. > ___ > Thanks for the input! I realized this is occurring because I'm allowing macOS to generate the date string according to its whims. If I do the string generation, then I can get consistent results. So I added the following line to my code: NSString *dateString = [NSDateFormatter localizedStringFromDate:configuredDate dateStyle:NSDateFormatterFullStyle timeStyle:NSDateFormatterLongStyle]; and now I get a standardized string I can at least can live with, valid for all situations: Configured date: Saturday, August 31, 2019 at 3:55:02 PM PDT -Carl P.S.: NSDateFormatter & friends are, shall I say, squirrelly beasts, best left undisturbed, hiding under the rock ... ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSLog displays inconsistent format for NSDate
On 31 Aug 2019, at 2:49, Carl Hoefs via Cocoa-dev wrote: Same result if I run it as a system daemon. So as you suggest it seems there could be some sort of environment sensitivity going on. If only I knew what env var to set in the shell... UTC really isn't what I'm looking for. The issue appears to be that `NSLog` sends your format string and arguments to the unified logging system, this is what Xcode and Console displays, and here you get dates formatted using the local time zone. But it *also* does a simple `stringWithFormat:` and sends the result to standard error, at least when running in a terminal. This is where you are seeing a more crude formatting of the date which is not adjusted to the local time zone. Open a new tab in your terminal, in that tab run this command: log stream|grep 'Configured date' Now run your executable, and in the tab where it is running, you should see the UTC date, but in the tab where you are watching the log stream, you get the local date. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
