UTC Calcs

UTC_Calcs.js

<!-- http://www.pipiscrew.com/2015/08/js-utc-calcs/ -->

<script>
    $(function () {
 		//init with date now
		$("[name=post_date]").val(date_formatter(new Date()));
		
        //edit button - read record
        function query_POSTS_modal(rec_id){
 
            $.ajax(
            {
                url : "tab_posts_fetch.php",
                type: "POST",
                data : { post_id : rec_id },
                success:function(data, textStatus, jqXHR)
                {
                    if (data!='null')
                    {
                        $('[name=post_date]').val(getGMTfromUTC(data.post_date));
                        console.log(getGMTfromUTC(data.post_date));
 
                        $('#lblTitle_POSTS').html("Edit Post");
                        $('#modalPOSTS').modal('toggle');
                    }
                }, error: function(jqXHR, textStatus, errorThrown)  {}
            });
        }
 
        ////////////////////////////////////////
        // MODAL SUBMIT aka save
        $('#formPOSTS').submit(function(e) {
            e.preventDefault();
 
            var postData =form.serializeArray();
            var formURL = form.attr("action");
 
            var dt = parseDate($("[name=post_date]").val());
            var post_date_utc = getUTCfromGMT(dt);
 
            //add date as UTC
            postData.push({name: "post_date_utc", value : JSON.stringify(post_date_utc)});
 
            $.ajax(
            {
                url : formURL,
                type: "POST",
                data : postData,
                success:function(data, textStatus, jqXHR)
                {               },
                error: function(jqXHR, textStatus, errorThrown)
                {               }
            });
        });
    }); //jQ
 
    function date_formatter(value) {
        if (value==null)
            return "";
 
        var date = new Date(value);
        var options = {
            year: "numeric", month: "2-digit",
            day: "2-digit", hour: "2-digit", minute: "2-digit", hour12: false
        };
 
        return(date.toLocaleString("en-GB", options));
    }
 
    function parseDate(dt_txt) {
        dt_txt= dt_txt.replace('T',' ');
        var data = dt_txt.split(' ');
        var datePart = data[0].split('/');
        var timePart = data[1].split(':');
 
        // new Date(year, month [, date [, hours[, minutes[, seconds[, ms]]]]])
        return (new Date(datePart[2], datePart[1] - 1, datePart[0], timePart[0], timePart[1]));
        // months are 0-based
    }
 
    function getUTCfromGMT(val) {
        var newDay = new Date();
        var t = new Date(val);
        var time1 = Math.round(t / 1000);
        return (time1);
    }
 
    function getGMTfromUTC(val) {
        var d = new Date();
        d.setTime(val * 1000);
 
        var hours = d.getHours();
        var minutes = d.getMinutes();
 
        if (hours < 10) {
            hours = "0" + hours;
        }
        if (minutes < 10) {
            minutes = "0" + minutes;
        }
 
        //http://www.w3schools.com/jsref/jsref_getmonth.asp
        // months are 0-based
        return d.getDate() + "/" + (d.getMonth() + 1) + "/" + d.getFullYear() + " " + hours + ":" + minutes;
    }
</script>
 
<input type="text" name="post_date" class="form-control" placeholder="dd/mm/yyyy hh:ii">