Re: timezone for web users?
Re: timezone for web users?
- Subject: Re: timezone for web users?
- From: Chuck Hill <email@hidden>
- Date: Mon, 08 Jul 2013 17:40:13 -0700
On 2013-07-08, at 5:34 PM, Paul Hoadley wrote:
> On 09/07/2013, at 3:29 AM, Jesse Tayler <email@hidden> wrote:
>
>> I realize I had apparently statically set the timezone to GMT?
>>
>> Maybe I did this for my database??
>>
>> I had this in my app constructor
>>
>> static {
>> // Set default time zones
>> //TimeZone.setDefault(TimeZone.getTimeZone("GMT"));
>> //NSTimeZone.setDefaultTimeZone(NSTimeZone.getGMT());
>> }
>>
>> once I noticed those two line and commented them out, general <wo:str>’s zapped into a correct timezone on display - my component is another story but--
>>
>> now I wonder if I’ll be storing my dates differently in the database?
>
> In my experience, you almost certainly want to leave those setDefault calls _in_. The only failsafe way to deal with timezones is to set UTC everywhere except the view layer. So, yes, you want to ensure your database is storing timestamps as UTC (and not doing any "helpful" timezone conversions on the way in or out), the JVM's default is UTC, and WebObjects default is UTC. The only time you do a conversion is on the way in from the view, or on the way out to the view, both using a user-selected or automatically-detected timezone offset.
Having spent many quality hours with time zones and time stamps in WO, I completely agree with Paul. Madness lies in any other direction.
Chuck
--
Chuck Hill
Executive Managing Partner, VP Development and Technical Services
Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/gvc/practical_webobjects
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