Dates before 1970 - PHP

Suhas wrote:
> Hello,
>
> I have a project that deals with the date time stamps since 1900 (and
> past), any suggestions about a good class that handles Date Time
> Format before 1970. I really like date() function and want something
> similar.

date() uses Unix timestamps which on most Unix platforms goes from
-MAX_INT to MAX_INT which means the date range is actually
12:45:52 12/13/1901 to 07:14:07 01/18/2038. So you might be able to get
away with it.

You can check it with:

echo date("h:i:s m/d/Y",-2147483648);
echo date("h:i:s m/d/Y", 2147483647);

Windows, not being Unix, doesn't understand that the timestamp can be
negative, although I think someone fixed that in PHP 5. In my 11+ years
of PHP I have yet to run PHP on Windows, so I wouldn't know.

-Rasmus

This will definitely solve one way but still other is there,
How to get that -ve number which starts at 1/1/1900 at 00:00 AM = 0

I need to be able to convert back and forth as there are some
calculations to be done on date field,

But this is very interesting..
Thx
SP

On 4/13/06, Rasmus Lerdorf <rasmus@lerdorf.com> wrote:
> Suhas wrote:
> > Hello,
> >
> > I have a project that deals with the date time stamps since 1900 (and
> > past), any suggestions about a good class that handles Date Time
> > Format before 1970. I really like date() function and want something
> > similar.
>
> date() uses Unix timestamps which on most Unix platforms goes from
> -MAX_INT to MAX_INT which means the date range is actually
> 12:45:52 12/13/1901 to 07:14:07 01/18/2038. So you might be able to get
> away with it.
>
> You can check it with:
>
> echo date("h:i:s m/d/Y",-2147483648);
> echo date("h:i:s m/d/Y", 2147483647);
>
> Windows, not being Unix, doesn't understand that the timestamp can be
> negative, although I think someone fixed that in PHP 5. In my 11+ years
> of PHP I have yet to run PHP on Windows, so I wouldn't know.
>
> -Rasmus
>


--
Contact @
Suhas Pharkute.
208 830 8915 (C)
208 429 6943 (H)

> I have a project that deals with the date time stamps since 1900 (and
> past), any suggestions about a good class that handles Date Time
> Format before 1970. I really like date() function and want something
> similar.

If you're using a database at all, most of them will handle any sort of dates.

--
Postgresql & php tutorials
http://www.designmagick.com/

Call me crazy, but I think that:

$time = 0xffffffff; //largest INT possible
echo date('m/d/Y h:i:s a', $time);

would be very revealing.

On Thu, April 13, 2006 10:26 pm, Suhas wrote:
> This will definitely solve one way but still other is there,
> How to get that -ve number which starts at 1/1/1900 at 00:00 AM = 0
>
> I need to be able to convert back and forth as there are some
> calculations to be done on date field,
>
> But this is very interesting..
> Thx
> SP
>
> On 4/13/06, Rasmus Lerdorf <rasmus@lerdorf.com> wrote:
>> Suhas wrote:
>> > Hello,
>> >
>> > I have a project that deals with the date time stamps since 1900
>> (and
>> > past), any suggestions about a good class that handles Date Time
>> > Format before 1970. I really like date() function and want
>> something
>> > similar.
>>
>> date() uses Unix timestamps which on most Unix platforms goes from
>> -MAX_INT to MAX_INT which means the date range is actually
>> 12:45:52 12/13/1901 to 07:14:07 01/18/2038. So you might be able to
>> get
>> away with it.
>>
>> You can check it with:
>>
>> echo date("h:i:s m/d/Y",-2147483648);
>> echo date("h:i:s m/d/Y", 2147483647);
>>
>> Windows, not being Unix, doesn't understand that the timestamp can
>> be
>> negative, although I think someone fixed that in PHP 5. In my 11+
>> years
>> of PHP I have yet to run PHP on Windows, so I wouldn't know.
>>
>> -Rasmus
>>
>
>
> --
> Contact @
> Suhas Pharkute.
> 208 830 8915 (C)
> 208 429 6943 (H)
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>


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>At 6:43 PM -0500 4/17/06, Richard Lynch wrote:
>Call me crazy, but I think that:
>
>$time = 0xffffffff; //largest INT possible
>echo date('m/d/Y h:i:s a', $time);
>
>would be very revealing.

Hmmmm.

Is: 12/31/1969 06:59:59 pm

Yes, it is -- I remember what I was doing then. It was six months
after I got out of the US Army.

And,

$time = -0xffffffff; //smallest INT possible
echo date('m/d/Y h:i:s a', $time);

Is: 12/13/1901 03:45:52 pm

Close to when I was born. :-)

Whereas,

$time = 0;
echo date('m/d/Y h:i:s a', $time);

Is: 12/31/1969 07:00:00 pm

But, what point is there in all this?

tedd


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