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To group data by date and time using MYSQL and Datatables, you can use the following steps:

1. In MYSQL, create a table that includes a column for the date and time.

2. Populate the table with data.

3. In Datatables, retrieve the data from the table and display it in the table.

4. Use the "moment" library in JavaScript to parse the date and time values.

5. Use the "moment" library to group the data by morning, afternoon, and evening, based on the hour of the day.

6. Display the grouped data in the Datatables table.

Here is an example code snippet in JavaScript using the moment library:

$(document).ready(function() {
    var table = $('#example').DataTable( {
        ajax: "/data.php",
        columns: [
            { data: "date_time" },
            { data: "value" }
        ],
        rowCallback: function(row, data) {
            var hour = moment.utc(data.date_time).hour();
            var time_of_day = "";
            if (hour >= 6 && hour < 12) {
                time_of_day = "Morning";
            } else if (hour >= 12 && hour < 18) {
                time_of_day = "Afternoon";
            } else {
                time_of_day = "Evening";
            }
            $('td:eq(0)', row).html(time_of_day);
        },
        order: [[ 0, "asc" ]]
    });
});

This code retrieves data from a MySQL table using an AJAX call to the "data.php" file. It then populates a Datatables table with the data, and applies a rowCallback function to group the data by morning, afternoon, and evening. The grouped data is then displayed in the Datatables table.