Understanding DateTime and Locale and formatting times in a locale?

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Understanding DateTime and Locale and formatting times in a locale?

Tim Mackinnon
Hi - I’m really confused about DateAndTime support in Pharo?

If I have a server app running in the EU, and a user makes a request from Canada, and I want to format the time they see to be in their timezone - how do I do that with the classes in Pharo?

I can ask for a DataAndTime nowUTC, and if I know the user is in en-CA, I can create a Locale for them - but then how do I get the correct time offset, or how to I format that UTC date in their locale?

Tim
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Re: Understanding DateTime and Locale and formatting times in a locale?

NorbertHartl
Have a look at #asLocal

Norbert

> Am 14.07.2017 um 23:04 schrieb Tim Mackinnon <[hidden email]>:
>
> Hi - I’m really confused about DateAndTime support in Pharo?
>
> If I have a server app running in the EU, and a user makes a request from Canada, and I want to format the time they see to be in their timezone - how do I do that with the classes in Pharo?
>
> I can ask for a DataAndTime nowUTC, and if I know the user is in en-CA, I can create a Locale for them - but then how do I get the correct time offset, or how to I format that UTC date in their locale?
>
> Tim

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Re: Understanding DateTime and Locale and formatting times in a locale?

Tim Mackinnon
Thanks for chipping in - but its the other way around that I’m after.

I am looking at ZTimestamp now -but again I don’t quite get it?

ZTimestamp now gives me a timestamp in UTC (great) but how do I format it to show it in say Canadian time?

I thought it would be something like:

ZTimestamp now printOn: stream timezone: (ZTimezone id: 'America/Halifax’) but it doesn’t seem to be that?

I must be missing something.

Tim

> On 14 Jul 2017, at 23:28, Norbert Hartl <[hidden email]> wrote:
>
> Have a look at #asLocal
>
> Norbert
>
>> Am 14.07.2017 um 23:04 schrieb Tim Mackinnon <[hidden email]>:
>>
>> Hi - I’m really confused about DateAndTime support in Pharo?
>>
>> If I have a server app running in the EU, and a user makes a request from Canada, and I want to format the time they see to be in their timezone - how do I do that with the classes in Pharo?
>>
>> I can ask for a DataAndTime nowUTC, and if I know the user is in en-CA, I can create a Locale for them - but then how do I get the correct time offset, or how to I format that UTC date in their locale?
>>
>> Tim
>


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Re: Understanding DateTime and Locale and formatting times in a locale?

Tim Mackinnon
Classic - the moment you write something, it suddenly dawns on you… its the other way around.

(ZTimezone id: 'America/Halifax’) gmtToLocal: ZTimestamp now…

Tim

> On 15 Jul 2017, at 00:34, Tim Mackinnon <[hidden email]> wrote:
>
> Thanks for chipping in - but its the other way around that I’m after.
>
> I am looking at ZTimestamp now -but again I don’t quite get it?
>
> ZTimestamp now gives me a timestamp in UTC (great) but how do I format it to show it in say Canadian time?
>
> I thought it would be something like:
>
> ZTimestamp now printOn: stream timezone: (ZTimezone id: 'America/Halifax’) but it doesn’t seem to be that?
>
> I must be missing something.
>
> Tim
>
>> On 14 Jul 2017, at 23:28, Norbert Hartl <[hidden email]> wrote:
>>
>> Have a look at #asLocal
>>
>> Norbert
>>
>>> Am 14.07.2017 um 23:04 schrieb Tim Mackinnon <[hidden email]>:
>>>
>>> Hi - I’m really confused about DateAndTime support in Pharo?
>>>
>>> If I have a server app running in the EU, and a user makes a request from Canada, and I want to format the time they see to be in their timezone - how do I do that with the classes in Pharo?
>>>
>>> I can ask for a DataAndTime nowUTC, and if I know the user is in en-CA, I can create a Locale for them - but then how do I get the correct time offset, or how to I format that UTC date in their locale?
>>>
>>> Tim
>>
>
>


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Re: Understanding DateTime and Locale and formatting times in a locale?

Sven Van Caekenberghe-2
Hi Tim,

Great that you found this out.

You can also use the 'by-example formatter/parser'.

ZTimestampFormat verbose
        timezone: (ZTimezone id: 'America/Halifax');
        format: ZTimestamp now.

  => 'Saturday, 15-July-2017 04:04:12 AM (-03:00)'

(ZTimestampFormat fromString: 'Sat, 03 February 2001 04:05:06 PM')
        timezone: (ZTimezone id: 'America/Halifax');
        format: ZTimestamp now.
       
  => 'Sat, 15 July 2017 04:04:18 AM'

The idea is that you create a format instance once and keep using it.

Sven

PS: Check the class comment!

> On 15 Jul 2017, at 01:57, Tim Mackinnon <[hidden email]> wrote:
>
> Classic - the moment you write something, it suddenly dawns on you… its the other way around.
>
> (ZTimezone id: 'America/Halifax’) gmtToLocal: ZTimestamp now…
>
> Tim
>
>> On 15 Jul 2017, at 00:34, Tim Mackinnon <[hidden email]> wrote:
>>
>> Thanks for chipping in - but its the other way around that I’m after.
>>
>> I am looking at ZTimestamp now -but again I don’t quite get it?
>>
>> ZTimestamp now gives me a timestamp in UTC (great) but how do I format it to show it in say Canadian time?
>>
>> I thought it would be something like:
>>
>> ZTimestamp now printOn: stream timezone: (ZTimezone id: 'America/Halifax’) but it doesn’t seem to be that?
>>
>> I must be missing something.
>>
>> Tim
>>
>>> On 14 Jul 2017, at 23:28, Norbert Hartl <[hidden email]> wrote:
>>>
>>> Have a look at #asLocal
>>>
>>> Norbert
>>>
>>>> Am 14.07.2017 um 23:04 schrieb Tim Mackinnon <[hidden email]>:
>>>>
>>>> Hi - I’m really confused about DateAndTime support in Pharo?
>>>>
>>>> If I have a server app running in the EU, and a user makes a request from Canada, and I want to format the time they see to be in their timezone - how do I do that with the classes in Pharo?
>>>>
>>>> I can ask for a DataAndTime nowUTC, and if I know the user is in en-CA, I can create a Locale for them - but then how do I get the correct time offset, or how to I format that UTC date in their locale?
>>>>
>>>> Tim
>>>
>>
>>
>
>


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