Question

I am using a jquery date picker and also setting a date through php date(‘Y-m-D’) functions. Both of them give different date for today. Jquery picker fills the field with the date that is one day ahead of php date(). Here is the function for jquery. I need jquery to show same date for today as php.

<script type="text/javascript" charset="utf-8">
        var $j = jQuery.noConflict();                   
         $j(function()
            {

                // initialise the "Select date" link
                $j('#date-pick')
                    .datePicker(
                        // associate the link with a date picker
                        {
                            createButton:false,
                            startDate: '01/01/1970',
                            endDate: (new Date()).asString()
                            //endDate:<?php echo date('y-m-d'); ?>
                        }
                    ).bind(
                        // when the link is clicked display the date picker
                        'click',
                        function()
                        {
                            updateSelects($j(this).dpGetSelected()[0]);
                            $j(this).dpDisplay();
                            return false;
                        }
                    ).bind(
                        // when a date is selected update the SELECTs
                        'dateSelected',
                        function(e, selectedDate, $td, state)
                        {
                            updateSelects(selectedDate);
                        }
                    ).bind(
                        'dpClosed',
                        function(e, selected)
                        {
                            updateSelects(selected[0]);
                        }
                    ).val(new Date().asString()).trigger('change');

                var updateSelects = function (selectedDate)
                {
                    var selectedDate = new Date(selectedDate);
                    if(selectedDate != "Invalid Date")
                    {
                    $j('#d').val(selectedDate.getDate());
                    $j('#m').val(selectedDate.getMonth()+1);
                    $j('#y').val(selectedDate.getFullYear());
                    }
                }
                // listen for when the selects are changed and update the picker

                // default the position of the selects to today
                var today = new Date();
                updateSelects(today.getTime());

            });
        </script>

Answer 1

jQuery uses the client computer’s date while php uses the server’s date. They’re basically different if you haven’t set the default timezone in php. Take a look at this:
http://php.net/manual/en/function.date-default-timezone-set.php

You can set the default timezone in php.ini file located on the PHP main directory (Eg. PHP5.4)

As for the using of the server’s date in the datepicker:

A quick google search lead me to this: how to display server side dates in jquery datepicker?
basically what they have done is creating a new date based on the current timestamp:

$timestamp = strtotime("2012-08-02");

minDate: new Date('<?php echo $timestamp; ?>');