PM/AM Formatting not working correctly

[OliverZiegler]

When changing your iPhone settings to 12 hour format and trying to get an iso date string, the string is not right.

Trying to parse an PM date the resulting output is an AM date

Printing description of gmtTimeDate: 30.11.2016, 10:00:00 PM GMT

gmtTimeDate.string(format: .iso8601(options: [.withInternetDateTime]))
"2016-11-30T10:00:00Z"

Is there anything I do wrong or is this a bug in SwiftDate.

My recent Settings of Date&Time are:
24-hours: off
automatic timezone: on
Timezone: Berlin

Edit:
Probably this is unexpected behaviour of NSDateFormater as you can see here

[malcommac]

Hi,
In order to parse correctly a 12h clock you need to use hh in place of HH for hour.
Based upon your string I suggest you to use a custom formatter:

Below an example:

let str = "30.11.2016, 10:00:00 PM GMT"
let date = try! str.date(format: .custom("dd.MM.yyyy',' hh:mm:ss a ZZZZ")) // 30 nov 2016, 23:00:00 CET

It will return 30 nov 2016, 23:00:00 CET as you need.
More on formatting options are available here

[OliverZiegler]

Unfortunately this won't solve my problem.

I need to parse a given date to the right ISO8601 String which won't happen if your device is on 12 hour mode.

If I create a Date with Date() or DateInRegion() and current time for example 10:00 PM or 22:00 the resulting ISO8601 string after formatting will be: 2016-11-30T10:00:00Z which is not the correct ISO8601 string.

Using following code will give me the right ISO8601 String for my date:

let region = Region(tz: TimeZoneName.gmt, cal: CalendarName.current, loc: LocaleName.englishUnitedStatesComputer)
let gmtDate = DateInRegion(absoluteDate:Date(), in: region)
let gmtTimeDate = try! gmtDate.atTime(hour: newValue.hour, minute: newValue.minute, second: newValue.second)
let string = gmtTimeDate.string(format: .iso8601(options: [.withInternetDateTime]))
print(string)

So prints out 2016-11-30T22:00:00Z

But trying to parse this string back to a Date or DateInRegion this won't work, so try "2016-11-30T22:00:00Z".date(format: .iso8601(options: [.withInternetDateTime])) will raise an exception.

As ISO8601 is strictly defined I think this is very unexpected behaviour and should be fixed.

Edit:
FYI:
Using

let region: Region = Region(tz: TimeZoneName.gmt, cal: CalendarName.current, loc: LocaleName.englishUnitedStatesComputer)
let date = try "2016-11-30T22:00:00Z".date(format: .iso8601(options: [.withInternetDateTime]), fromRegion: region)

will work and result in the right Date.
So for parsing ISO8601 strings there should always be used the "en_US_POSIX" Locale I think (and this should be done internally).

[malcommac]

I think you are right, we should set en_US_POSIX manually. Thank you 👍
Added for 4.0.9.

[malcommac]

Just for reference, this is the official statement from Apple regarding NSDateFormatter and Internet Date&Time