On Tue, Aug 2, 2011 at 10:24 PM, Marc Delisle <marc@infomarc.info> wrote:

Ammar,

Zoom-search of date values needs improvement. Here is an example table:

CREATE TABLE IF NOT EXISTS `birthday` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(50) NOT NULL,
`birthday` date NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=5 ;

INSERT INTO `birthday` (`id`, `name`, `birthday`) VALUES
(1, 'A', '1950-01-01'),
(2, 'B', '1950-02-02'),
(3, 'C', '1960-03-03'),
(4, 'D', '2000-04-04');

Generating a plot via zoom-search show that the same time elapsed
between two days (in 1950) than in ten or forty years.

If you could convert these dates to a number of days (probably at the
Javascript layer), the same way than in MySQL [0], you would get
meaningful results. Of course you still need to display the unconverted
date value.

[0]
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_to-days

I looked up in the reference manual and I think Highcharts will do that automatically ( calculate distance between dates) if we can convert the date into specific format, like the dateFormat function specified [0] will probably work.
I'll need to have cases for each of the date and time types in MySQL [1] ( format to be chosen accordingly, like for datetime: '%e. %b %Y, %H:%M:%S' and for year: ' %Y ' only)

[0] http://www.highcharts.com/ref/#highcharts-object
[1] http://dev.mysql.com/doc/refman/5.0/en/date-and-time-types.html

--
Marc Delisle
http://infomarc.info

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