PHP - Moved: Your Javascript Is Disabled Display

Hello JS experts,   I'm new to JS coding (self-learning) and I have just one (potenitally) simple request to ask of you wonderful folks here.   Oh BTW, I've tried searching through this forum (and the WWW as well) but couldn't seem to easily find something that fits my request, or was easy for me to understand and apply to my situation.   So what I have/want is: a Data-Entry form which (for the first record/entry for a given date) allows the user to select a date from a "Calendar Date Picker".  Upon subsequent records/entries (for the same date), the date field should no longer be accessible, but the (previously entered/selected) value should be both displayed (greyed-out) and certainly carried over to the DB/Table.   I know this might be a very simple piece of code, but being that I'm a newbie, I'm not sure how to achieve this.   Would appreciate any and all help to get this done (preferably the necessary code).   If it helps, here's some of my existing code that's related to the field names:   Form field details:

                <div class="control-group">

                    <label class='control-label'>Select Flyer Start Date:</label>

                    <input type="text" name="datepicker" id="datepicker">

                </div>

DB (table) field details:

         $flyerDateStart = isset($_POST["datepicker"]) ? $_POST["datepicker"] : "";

Thanks much.

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