Re: Times in other cities
Re: Times in other cities
- Subject: Re: Times in other cities
- From: Jonathan Mitchell <email@hidden>
- Date: Mon, 15 May 2017 14:04:26 +0100
You might want to err on the side of caution and ensure that the Calendar object is explicitly set to Gregorian rather than using the current system setting.
Jonathan
> On 15 May 2017, at 13:50, Eric E. Dolecki <email@hidden> wrote:
>
> Thanks for your reply. Does this look safe to use?
>
> // London
> let locale = TimeZone.init(abbreviation: "BST")
> let cal = Calendar.current
> let date = Date()
> let comp = cal.dateComponents(in:locale!, from: date)
>
> // Local (right now for me it's Boston)
> let hour = Calendar.current.component(.hour, from: date)
>
> print("HOUR OFFSET: \(comp.hour! - hour)") //HOUR OFFSET: 5
>
> It's okay if the modifier is negative (Los Angeles from Boston, etc.)
>
>
>
>
>
>
> On Sun, May 14, 2017 at 9:29 PM Jens Alfke <email@hidden> wrote:
>
>>
>>> On May 14, 2017, at 5:47 PM, Eric Dolecki <email@hidden> wrote:
>>>
>>> I have a clock. If like to present the times in a few major cities. Say
>> London, England. Based on the user's current time zone, present the correct
>> hour, min, and second for London. If I can see how to do it for one city, I
>> should be good for others.
>>
>> Get an NSTimeZone instance based on a GMT offset or a name
>> Create an NSDateFormatter and set its timeZone property.
>> Use the formatter to convert [NSDate date] to a string.
>>
>> If you want to display the time in some other way, like an analog clock,
>> use NSDateComponents instead of NSDateFormatter; then you can get the
>> hours, minutes and seconds.
>>
>> —Jens
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