1 files changed, 45 insertions, 0 deletions

diff --git a/skins/common/prefs.js b/skins/common/prefs.js
index d9a612f9..c2554c00 100644
--- a/skins/common/prefs.js
+++ b/skins/common/prefs.js
@@ -95,6 +95,7 @@ function unhidetzbutton() {
 	if (tzb) {
 		tzb.style.display = 'inline';
 	}
+	updateTimezoneSelection(false);
 }
 
 // in [-]HH:MM format...
@@ -113,6 +114,50 @@ function fetchTimezone() {
 
 function guessTimezone(box) {
 	document.getElementsByName("wpHourDiff")[0].value = fetchTimezone();
+	updateTimezoneSelection(true);
+}
+
+function updateTimezoneSelection(force_offset) {
+	var wpTimeZone = document.getElementsByName("wpTimeZone")[0];
+	var wpHourDiff = document.getElementsByName("wpHourDiff")[0];
+	var wpLocalTime = document.getElementById("wpLocalTime");
+	var wpServerTime = document.getElementsByName("wpServerTime")[0];
+	var minDiff = 0;
+
+	if (force_offset) wpTimeZone.selectedIndex = 1;
+	if (wpTimeZone.selectedIndex == 1) {
+		wpHourDiff.disabled = false;
+		var diffArr = wpHourDiff.value.split(':');
+		if (diffArr.length == 1) {
+			minDiff = parseInt(diffArr[0], 10) * 60;
+		} else {
+			minDiff = Math.abs(parseInt(diffArr[0], 10))*60 + parseInt(diffArr[1], 10);
+			if (parseInt(diffArr[0], 10) < 0) minDiff = -minDiff;
+		}
+	} else {
+		wpHourDiff.disabled = true;
+		var diffArr = wpTimeZone.options[wpTimeZone.selectedIndex].value.split('|');
+		minDiff = parseInt(diffArr[1], 10);
+	}
+	if (isNaN(minDiff)) minDiff = 0;
+	var localTime = parseInt(wpServerTime.value, 10) + minDiff;
+	while (localTime < 0) localTime += 1440;
+	while (localTime >= 1440) localTime -= 1440;
+
+	var hour = String(Math.floor(localTime/60));
+	if (hour.length<2) hour = '0'+hour;
+	var min = String(localTime%60);
+	if (min.length<2) min = '0'+min;
+	changeText(wpLocalTime, hour+':'+min);
+
+	if (wpTimeZone.selectedIndex != 1) {
+		hour = String(Math.abs(Math.floor(minDiff/60)));
+		if (hour.length<2) hour = '0'+hour;
+		if (minDiff < 0) hour = '-'+hour;
+		min = String(minDiff%60);
+		if (min.length<2) min = '0'+min;
+		wpHourDiff.value = hour+':'+min;
+	}
 }
 
 hookEvent("load", unhidetzbutton);