Date and Time

Hello,

Is there any function to convert a Date/Time from UTC to the user
client zone and back from user client zone to UTC?

I want to store Date/Time in UTC in the database but display it in
local use Date/Time.

Thanks,
Miguel

shapper wrote:Probably yes. Please define "UTC" and "user client zone".


PointedEars
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On Sep 4, 10:37*pm, Thomas 'PointedEars' Lahn <PointedE...@web.de>
wrote:
Is that ignorance or merely perversity? UTC is a standard term, and
can be found in ISO/IEC 16262 with which you should be familiar (31
times, as a "word"; others as part of a method name). And "user
client zone" makes aense in English, thogh "zone" must be talen as
"region" and not "Time Zone" to be accurate.

OP : see in/via <URL:http://www.merlyn.demon.co.uk/js-dates.htmand a
Date Object Methods reference as there cited.

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Dr J R Stockton wrote:It is a request.
It matters which UTC and "user client zone" format is used here.


PointedEars
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Use any version of Microsoft Frontpage to create your site.
(This won't prevent people from viewing your source, but no one
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On Sep 5, 11:57 am, Thomas 'PointedEars' Lahn <PointedE...@web.de>
wrote:I don't think you two realize how embarrassing your little tiff is to
the rest of us. Please grow up, both of you.

Steve.

Steve wrote on 05 sep 2008 in comp.lang.javascript:
Nonsense, only your own actions can be embarrasing on Usenet.


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On Sep 5, 10:46 pm, "Evertjan." <exjxw.hannivo...@interxnl.netwrote:Hmmmm? OK, if you say so :-)

In comp.lang.javascript message <48C1028D.5070402@PointedEars.de>, Fri,
5 Sep 2008 11:57:33, Thomas 'PointedEars' Lahn <PointedEars@web.de>
posted:You wrote nothing about "format". You should answer more slowly,
allowing yourself time to think more about the question and your
possible answers.

The OP may, but does not necessarily, want to convert between strings;
my first thought was of converting, for example, the result of
new Date(Y_UTC, ... , s_UTC)
to what would have been given by
new Date(Date.UTC(Y_UTC, ... , s_UTC))
and/or /vice versa/.

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Dr J R Stockton wrote:Therefore I asked.


PointedEars
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On Sep 6, 5:54*pm, Thomas 'PointedEars' Lahn <PointedE...@web.de>
wrote:Hello,

I have seen this happening, a few times with me, both in CSS and
Javascript groups.

A discussion starts for nothing ... I will say what I usually say. Go
to the beach and relax ... :-)

Anyway, back to what is important. First of all let me say that I am
not Javascript expert. My problem is:

On my MVC application I have a few web pages with forms which has
inputs for date and time on the following format:

"2008-09-14 23:05:37"

On my database I save all dates and times in UTC (http://www.iso.org/
iso/date_and_time_format) format.

However I need to:

1. Convert the UTC Date/Time in a form input to the Time Zone of the
user.
This should be done after the form is loaded so the value is there.

2. Convert the Date/Time string inserted by the user from its TimeZone
to UTC and replace it in the input when the form is submitted.
This way on my server side code I will get the correct Date/Time to
insert in the database.

I know this can't be done on the server side. On the server side I am
not able to get the Local Time Zone. Only UTC.

Note: When I say conversion I mean that in UTC 2008-09-13 23:10:40
might be 2008-09-14 02:10:40 ...

Thanks,
Miguel

shapper wrote:Which is the "user client zone" value, I presume? OK.
And I asked you to define that. In particular, how do you store UTC in your
database? There are a number of ways, including the number of milliseconds
since epoch, several time formats, and one of the standard UTC formats.

The time format you are using determines what would be the best approach to
convert from and to it.
So, what have you tried already?
It is not helpful, though.


PointedEars
--
Anyone who slaps a 'this page is best viewed with Browser X' label on
a Web page appears to be yearning for the bad old days, before the Web,
when you had very little chance of reading a document written on another
computer, another word processor, or another network. -- Tim Berners-Lee

In comp.lang.javascript message <fbfd9f68-c963-48df-9bb0-4a07a4bc19ab@y3
8g2000hsy.googlegroups.com>, Sat, 6 Sep 2008 16:16:21, shapper
<mdmoura@gmail.composted:
Not comprehensibly, though; so it does not count.

Then you should have learned by now to trim quotes, especially sigs.

Unspecified time zone; inadequate data. Assumed local.

RegExp substitute - to /, append " UTC", read with new date(String).
You can show it with the non-UTC methods, and you can generate a numeric
offset indication from getTimezoneOffset. Offset abbreviations cannot
be generated, and cannot (apart from GMT & UTC) be read cross-browser.
Read it with new Date and no offset indication; use the UTC methods to
generate the reply string, followed by " UTC" or "Z" or numeric form for
clarity.
Which parts of that are not demonstrated in <URL:http://www.merlyn.demon
..co.uk/js-dates.htmff.?

Note that it will be more efficient, user-side, to transmit/receive
date/times as milliseconds from UTC 1970.0 - and if server-side can
handle that, it will be efficient there too.


Which gives me an opportunity to ask how this might put in valid PHP?
PSEUDOCODE :
var Now = new Date( <?php echo +new Date() ?) // possibly


It's a good idea to read the newsgroup c.l.j and its FAQ. See below.

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shapper wrote:
Local date to UTC:

var L = '2008-11-30 00:48:07';
alert((new Date(L.replace(/-/g,'/'))).toUTCString());

UTC to local date:

var U = '2008-06-21 22:18:36';
alert((new Date((U+' UTC').replace(/-/g,'/'))).toLocaleString());

Note that there might be different daylight saving times.
'toUTCString()' or 'toGMTString()' is probably a matter of preference.
For the conversion of date strings back into 'YYYY-MM-DD HH:MM:SS',
please see:
http://groups.google.com/group/comp....277c9f91b3fb0/

Hope this helps,

--
Bart

Bart Van der Donck wrote:
It appears that 'toUTCString' is better.

http://developer.mozilla.org/En/Core...te/ToGMTString
http://msdn.microsoft.com/en-us/libr...82(VS.85).aspx

--
Bart

In comp.lang.javascript message <fd03bf9e-0f47-4cff-990d-afc13269ef1c@2g
2000hsn.googlegroups.com>, Tue, 9 Sep 2008 10:26:01, Bart Van der Donck
<bart@nijlen.composted:ISO/IEC 16262 is more authoritative. It says that (initially) both
names refer to the same routine, but prefers the UTC name. However,
since UTC has Leap Seconds while GMT and JavaScript do not, toGMTString
is etymologically the better name, at least for Firefox.

The second quoted link has information which in my IE7 is false, though
it is true in FF2.0.0.16. In both browsers, the "two methods" do appear
to be one method with two names. However, the IE7 method clearly
differs from the FF2 method.

A coder should, if reading the results of such a method, allow for the
possibility of getting either GMT or UTC.

The OP should be aware that the standard requires the current-day Summer
Time rules to be applied, so a US date of 31 March should be deemed to
be in Winter Time, even if in 2006 ... or in BC 123456,

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