Four jQuery date time pickers
So:

function configureDateTimePicker(selector1,selector2)
{
    $(selector1).datetimepicker(
    {
        defaultTime: '07:00',
        lang: 'en',
        className: 'setTimeClicker',
        step: 30,
        onChangeDateTime: function (current_time, $input)
        {
            // alert(ct.dateFormat('d/m/Y'))
            $(selector2).removeClass('empty').val(current_time.dateFormat('Y-m-d H:i'));
        },
        inline: true
    });
}

configureDateTimePicker('.jqDatetimeDateOne','#emailGenDateOne');
configureDateTimePicker('.jqDatetimeDateTwo','#emailGenDateTwo');
configureDateTimePicker('.jqDatetimeSearchDateOne','#searchGenDateOne');
configureDateTimePicker('.jqDatetimeSearchDateTwo','#searchGenDateTwo');


There could be further optimisations if you changed your classes/ids so that one could be derived from the other or from a common string (e.g. if they were all .jqDatetimeSomething and #genSomething). Or if there's a way to find the one of the targets through their relationship in the DOM (e.g. one is a descendant of the other matching a given selector).