<textarea id="gui-form-comment" name="comment" placeholder="Opmerking" style="width:100%;"></textarea>
var TodayDate = new Date();
var n = TodayDate.getHours();
var d = TodayDate.getDate();
if (n <= 14) {https://jsfiddle.net/#save
var dag = d;
} else {
var dag = (d+1);
}
var month = new Array();
month[0] = "januari";
month[1] = "februari";
month[2] = "maart";
month[3] = "april";
month[4] = "mei";
month[5] = "juni";
month[6] = "juli";
month[7] = "augustus";
month[8] = "september";
month[9] = "oktober";
month[10] = "november";
month[11] = "december";
var m = month[TodayDate.getMonth()];
var y = TodayDate.getFullYear();
$('#gui-form-comment').val('Levering op '+(dag+1)+' '+m+' '+y+'');
FIDDLE
https://jsfiddle.net/webmazing/k6pfwLub/
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