That's really a good bunch of information.
Thanks,
Sumit.
On Mon, May 25, 2009 at 2:43 PM, Lester Caine <lester@xxxxxxxxxxx> wrote:
> Sumit Sharma wrote:
>
>> Hi,
>>
>> What I mean is my windows time is set to local time but when I use any
>> date
>> function in PHP it shows time in GMT on web browser and to change this I
>> have to use putenv("TZ=asia/calcutta");
>>
>> Thus:
>>
>> 1 There is no problem with Windows time its according to IST.
>> 2 Problem start with PHP, which displays GMT time by default.
>> 3 To solve this I was advised to change the OS time which is already
>> changed.
>>
>> Now I am not aware how the php date functions picking GMT time and from
>> where?
>>
>
> Basic time is always UTC ( GMT is the same ) and so unless you TELL it
> otherwise, PHP displays UTC. That way if you have clients accessing from
> different time zones they get a consistent time.
>
> If you want to display a particular time zone for a client, then you need
> to know what timezone that client is in, which is where "TZ=asia/calcutta"
> sets it globally for your site. Windows does not provide sufficient data to
> identify the timezone and so PHP defaults to it not being set.
>
> http://us2.php.net/manual/en/book.datetime.php covers the date functions
> that were added in PHP5.1, and which replace the earlier methods since they
> actually handle daylight saving as well, something that TZ and the earlier
> browser based time zone information simply ignores ...
>
> --
> Lester Caine - G8HFL
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