diff --git a/index.html b/index.html
index 443751c..7a7c6ea 100644
--- a/index.html
+++ b/index.html
@@ -233,15 +233,23 @@
 			// ------------
 			// Prefill form
 			
-			let dateNow = new Date();
-			dateNow.setSeconds(0);
-			dateNow.setMilliseconds(0);
+			function dateToISOStringLocal(date) {
+				function pad(n) {
+					if (n < 10) {
+						return '0' + n;
+					}
+					return '' + n;
+				}
+				
+				return date.getFullYear() + '-' + pad(date.getMonth() + 1) + '-' + pad(date.getDate()) + 'T' + pad(date.getHours()) + ':' + pad(date.getMinutes());
+			}
 			
+			let dateNow = dateToISOStringLocal(new Date());
 			if (document.getElementById('time_birth').value === '') {
-				document.getElementById('time_birth').valueAsDate = dateNow;
+				document.getElementById('time_birth').value = dateNow;
 			}
 			if (document.getElementById('time_measurement').value === '') {
-				document.getElementById('time_measurement').valueAsDate = dateNow;
+				document.getElementById('time_measurement').value = dateNow;
 			}
 			
 			// --------------------------