diff --git a/debian/changelog b/debian/changelog
index 51ba36fa..be146066 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,4 +1,4 @@
-hedera-web (1.407.12) stable; urgency=low
+hedera-web (1.407.13) stable; urgency=low
 
   * Initial Release.
 
diff --git a/forms/ecomerce/checkout/checkout.js b/forms/ecomerce/checkout/checkout.js
index 1a9ea7bf..216a5e38 100644
--- a/forms/ecomerce/checkout/checkout.js
+++ b/forms/ecomerce/checkout/checkout.js
@@ -27,6 +27,8 @@ Hedera.Checkout = new Class({
 		
 		if (!date || date.getTime() < (new Date()).getTime()) {
 			date = new Date();
+			date.setHours(0, 0, 0, 0);
+
 			var addDays = 0;
 
 			switch(date.getDay()) {
@@ -41,7 +43,7 @@ Hedera.Checkout = new Class({
 			if (i.get('deliveryMethod') != 'PICKUP')
 				addDays++;
 
-			date.setTime(date.getTime() + addDays * 86400000);
+			date.setDate(date.getDate() + addDays);
 		}
 		
 		this.$('date').value = date;
diff --git a/js/db/connection.js b/js/db/connection.js
index 8b440468..e2b96987 100644
--- a/js/db/connection.js
+++ b/js/db/connection.js
@@ -29,14 +29,12 @@ var Type =
 	,DATE_TIME : 9
 };
 
-Connection.extend
-({
+Connection.extend({
 	 Flag: Flag
 	,Type: Type
 });
 
-Connection.implement
-({
+Connection.implement({
 	Extends: Vn.JsonConnection
 
 	/**
@@ -76,7 +74,7 @@ Connection.implement
 	 * Parses a value to date.
 	 */
 	,valueToDate: function(value) {
-		return new Date(value);
+		return fixTz(new Date(value));
 	}
 
 	/*
@@ -121,3 +119,26 @@ Connection.implement
 	}
 });
 
+// TODO: Read time zone from db configuration
+var tz = {timeZone: 'Europe/Madrid'};
+var isLocal = Intl
+	.DateTimeFormat()
+	.resolvedOptions()
+	.timeZone == tz.timeZone;
+
+function fixTz(date) {
+	if (isLocal) return date;
+
+	var localDate = new Date(date.toLocaleString('en-US', tz));
+	var hasTime = localDate.getHours()
+		|| localDate.getMinutes()
+		|| localDate.getSeconds()
+		|| localDate.getMilliseconds(); 
+
+	if (!hasTime) {
+		date.setHours(date.getHours() + 12);
+		date.setHours(0, 0, 0, 0);
+	}
+
+	return date;
+}
diff --git a/js/htk/field/calendar.js b/js/htk/field/calendar.js
index 82e223f1..c024feb6 100644
--- a/js/htk/field/calendar.js
+++ b/js/htk/field/calendar.js
@@ -1,6 +1,5 @@
 
-module.exports = new Class
-({
+module.exports = new Class({
 	Extends: Htk.Field
 	,Tag: 'htk-calendar'
 	,Properties:
@@ -8,12 +7,10 @@ module.exports = new Class
 		restrictFunc:
 		{
 			type: Function
-			,set: function (x)
-			{
+			,set: function(x) {
 				this._restrictFunc = x;
 			}
-			,get: function (x)
-			{
+			,get: function(x) {
 				return this._restrictFunc;
 			}
 		}
@@ -24,83 +21,79 @@ module.exports = new Class
 	,year: null
 	,month: null
 
-	,render: function ()
-	{
+	,render: function() {
 		var len = Vn.Date.WDays.length;
 		
-		var node = this.createRoot ('div');
+		var node = this.createRoot('div');
 		node.className = 'htk-calendar';
 		
-		var table = this.createElement ('table');
-		this.node.appendChild (table);
+		var table = this.createElement('table');
+		this.node.appendChild(table);
 
-		var colgroup = this.createElement ('colgroup');
-		table.appendChild (colgroup);
+		var colgroup = this.createElement('colgroup');
+		table.appendChild(colgroup);
 		
 		for (var i = 0; i < len; i++)
-			colgroup.appendChild (this.createElement ('col'));
+			colgroup.appendChild(this.createElement('col'));
 		
-		var thead = this.createElement ('thead');
-		table.appendChild (thead);
+		var thead = this.createElement('thead');
+		table.appendChild(thead);
 
-		var tr = this.createElement ('tr');
-		thead.appendChild (tr);
+		var tr = this.createElement('tr');
+		thead.appendChild(tr);
 
-		var th = this.createElement ('th');
-		th.appendChild (this.createTextNode ('<'));
+		var th = this.createElement('th');
+		th.appendChild(this.createTextNode('<'));
 		th.className = 'button';
-		th.addEventListener ('click', this.prevMonthClicked.bind (this));
-		tr.appendChild (th);
+		th.addEventListener('click', this.prevMonthClicked.bind(this));
+		tr.appendChild(th);
 
-		var th = this.createElement ('th');
+		var th = this.createElement('th');
 		th.colSpan = 5;
-		tr.appendChild (th);
+		tr.appendChild(th);
 
-		var monthNode = this.createElement ('span');
-		th.appendChild (monthNode);
+		var monthNode = this.createElement('span');
+		th.appendChild(monthNode);
 
-		var space = this.createTextNode (' ');
-		th.appendChild (space);
+		var space = this.createTextNode(' ');
+		th.appendChild(space);
 		
-		var yearNode = this.createElement ('span');
-		th.appendChild (yearNode);
+		var yearNode = this.createElement('span');
+		th.appendChild(yearNode);
 
-		var th = this.createElement ('th');
-		th.appendChild (this.createTextNode ('>'));
+		var th = this.createElement('th');
+		th.appendChild(this.createTextNode('>'));
 		th.className = 'button';
-		th.addEventListener ('click', this.nextMonthClicked.bind (this));
-		tr.appendChild (th);
+		th.addEventListener('click', this.nextMonthClicked.bind(this));
+		tr.appendChild(th);
 		
-		var tr = this.createElement ('tr');
-		thead.appendChild (tr);
+		var tr = this.createElement('tr');
+		thead.appendChild(tr);
 		
-		for (var i = 1; i <= len; i++)
-		{
-			var th = this.createElement ('th');
-			tr.appendChild (th);
+		for (var i = 1; i <= len; i++) {
+			var th = this.createElement('th');
+			tr.appendChild(th);
 			
 			var weekday = _(Vn.Date.AbrWDays [i%len]);
-			th.appendChild (this.createTextNode (weekday));
+			th.appendChild(this.createTextNode(weekday));
 		}
 
-		var tbody = this.createElement ('tbody');
-		table.appendChild (tbody);
+		var tbody = this.createElement('tbody');
+		table.appendChild(tbody);
 		
-		for (var i = 0; i < 6; i++)
-		{
-			var tr = this.createElement ('tr');
-			tbody.appendChild (tr);
+		for (var i = 0; i < 6; i++) {
+			var tr = this.createElement('tr');
+			tbody.appendChild(tr);
 
-			for (var j = 0; j < len; j++)
-			{
-				var td = this.createElement ('td');
-				td.addEventListener ('click', this.dayClicked.bind (this, td, i*len+j));
-				tr.appendChild (td);
+			for (var j = 0; j < len; j++) {
+				var td = this.createElement('td');
+				td.addEventListener('click', this.dayClicked.bind(this, td, i*len+j));
+				tr.appendChild(td);
 				
-				var div = this.createElement ('div');
-				td.appendChild (div);
+				var div = this.createElement('div');
+				td.appendChild(div);
 
-				this.cells.push ({
+				this.cells.push({
 					node: div,
 					enabled: false,
 					day: -1
@@ -110,11 +103,10 @@ module.exports = new Class
 
 		this.monthNode = monthNode;
 		this.yearNode = yearNode;
-		this.goToCurrentMonth ();
+		this.goToCurrentMonth();
 	}
 
-	,getMonthDays: function ()
-	{
+	,getMonthDays: function() {
 		if (this.month > 6)
 			return (this.month % 2 != 0) ? 31 : 30;
 		else if (this.month != 1)
@@ -123,63 +115,54 @@ module.exports = new Class
 			return (this.year % 4 != 0) ? 28 : 29;
 	}
 	
-	,goToMonth: function (year, month)
-	{
+	,goToMonth: function(year, month) {
 		if (year)
 			this.year = year;
-		if (!isNaN (month))
+		if (!isNaN(month))
 			this.month = month;
 
-		this.refresh ();
+		this.refresh();
 	}
 	
-	,goToSelectedMonth: function ()
-	{
+	,goToSelectedMonth: function() {
 		var date = this._value;
 		
 		if (date instanceof Date)
-			this.goToMonth (date.getFullYear (), date.getMonth ());
+			this.goToMonth(date.getFullYear(), date.getMonth());
 		else
-			this.goToCurrentMonth ();			
+			this.goToCurrentMonth();			
 	}
 
-	,goToCurrentMonth: function ()
-	{
-		var date = new Date ();
-		this.goToMonth (date.getFullYear (), date.getMonth ());
+	,goToCurrentMonth: function() {
+		var date = new Date();
+		this.goToMonth(date.getFullYear(), date.getMonth());
 	}
 
-	,refresh: function ()
-	{
-		Vn.Node.setText (this.yearNode, this.year);
-		Vn.Node.setText (this.monthNode, _(Vn.Date.Months[this.month]));
+	,refresh: function() {
+		Vn.Node.setText(this.yearNode, this.year);
+		Vn.Node.setText(this.monthNode, _(Vn.Date.Months[this.month]));
 
 		var day = 1;
-		var cellDate = new Date (this.year, this.month, 1);
+		var cellDate = new Date(this.year, this.month, 1);
 
-		var weekDay = cellDate.getDay ();
+		var weekDay = cellDate.getDay();
 		var firstWeekDay = (weekDay != 0) ? weekDay - 1 : 6;
-		var monthDays = this.getMonthDays ();
+		var monthDays = this.getMonthDays();
 
-		for (var i = 0; i < this.cells.length; i++)
-		{
+		for (var i = 0; i < this.cells.length; i++) {
 			var cell = this.cells[i];
 
-			if (firstWeekDay <= i && day <= monthDays)
-			{
-				Vn.Node.setText (cell.node, day);
+			if (firstWeekDay <= i && day <= monthDays) {
+				Vn.Node.setText(cell.node, day);
 				cell.enabled = true;
 				cell.day = day++;
 				
-				if (this._restrictFunc)
-				{
-					cell.enabled = this._restrictFunc (cellDate);
-					cellDate.setDate (cellDate.getDate () + 1);
+				if (this._restrictFunc) {
+					cell.enabled = this._restrictFunc(cellDate);
+					cellDate.setDate(cellDate.getDate() + 1);
 				}
-			}
-			else
-			{
-				Vn.Node.removeChilds (cell.node);
+			} else {
+				Vn.Node.removeChilds(cell.node);
 				cell.enabled = false;
 				cell.day = -1;
 			}
@@ -189,13 +172,12 @@ module.exports = new Class
 
 		// Marks the current day
 
-		var today = new Date ();
+		var today = new Date();
 		
-		if (this.year == today.getFullYear ()
-		&& this.month == today.getMonth ())
-		{
-			var cellIndex = (firstWeekDay + today.getDate ()) - 1;
-			Vn.Node.addClass (this.cells[cellIndex].node, 'today');
+		if (this.year == today.getFullYear()
+		&& this.month == today.getMonth()) {
+			var cellIndex = (firstWeekDay + today.getDate()) - 1;
+			Vn.Node.addClass(this.cells[cellIndex].node, 'today');
 		}
 		
 		// Marks the selected day
@@ -203,70 +185,74 @@ module.exports = new Class
 		var date = this._value;
 
 		if (date instanceof Date
-		&& this.year == date.getFullYear ()
-		&& this.month == date.getMonth ())
-			this.selectCell ((firstWeekDay + date.getDate ()) - 1);
+		&& this.year == date.getFullYear()
+		&& this.month == date.getMonth())
+			this.selectCell((firstWeekDay + date.getDate()) - 1);
 		else
-			this.selectCell (-1);
+			this.selectCell(-1);
 	}
 
-	,selectCell: function (cellIndex)
-	{
-		if (this.selectedCell != -1)
-		{
+	,selectCell: function(cellIndex) {
+		if (this.selectedCell != -1) {
 			var node = this.cells[this.selectedCell].node;
-			Vn.Node.removeClass (node, 'selected');
+			Vn.Node.removeClass(node, 'selected');
 		}
-		if (cellIndex != -1)
-		{
+		if (cellIndex != -1) {
 			var node = this.cells[cellIndex].node;
-			Vn.Node.addClass (node, 'selected');
+			Vn.Node.addClass(node, 'selected');
 		}
 
 		this.selectedCell = cellIndex;
 	}
 
-	,putValue: function (value)
-	{
-		this.goToSelectedMonth ();
+	,putValue: function() {
+		this.goToSelectedMonth();
 	}
 
-	,dayClicked: function (td, cellIndex)
-	{
+	,dayClicked: function(td, cellIndex) {
 		var cell = this.cells[cellIndex];
 	
-		if (cell.enabled)
-		{
-			this.selectCell (cellIndex);
+		if (cell.enabled) {
+			this.selectCell(cellIndex);
 
-			var newDate = new Date (this.year, this.month, cell.day);
-			this.valueChanged (newDate);
+			var newDate = new Date(this.year, this.month, cell.day);
+
+			if (this.value) {
+				var orgDate = this.value instanceof Date
+					? this.value
+					: new Date(this.value);
+
+				newDate.setHours(
+					orgDate.getHours(),
+					orgDate.getMinutes(),
+					orgDate.getSeconds(),
+					orgDate.getMilliseconds()
+				);
+			}
+
+			this.valueChanged(newDate);
 		}
 	}
 
-	,prevMonthClicked: function ()
-	{
+	,prevMonthClicked: function() {
 		if (this.month > 0)
 			this.month--;
-		else
-		{
+		else {
 			this.month = 11;
 			this.year--;
 		}
 		
-		this.refresh ();
+		this.refresh();
 	}
 
-	,nextMonthClicked: function ()
-	{
+	,nextMonthClicked: function() {
 		if (this.month < 11)
 			this.month++;
-		else
-		{
+		else {
 			this.month = 0;
 			this.year++;
 		}
 		
-		this.refresh ();
+		this.refresh();
 	}
 });
diff --git a/js/sql/value.js b/js/sql/value.js
index 3460f42d..41e7ab64 100644
--- a/js/sql/value.js
+++ b/js/sql/value.js
@@ -91,14 +91,19 @@ module.exports = new Class({
 		case 'string':
 			return "'" + v.replace(this.regexp, this.replaceFunc) + "'";
 		default:
-			if (v instanceof Date) {
-				// TODO: Read time zone from db configuration
-				var tz = {timeZone: 'Europe/Madrid'};
-				var localeDate = new Date(v.toLocaleString('en-US', tz));
-				return Vn.Date.strftime(localeDate, '\'%Y-%m-%d\'');
-			} else {
+			if (v instanceof Date)
+				return Vn.Date.strftime(fixTz(v), '\'%Y-%m-%d\'');
+			else
 				return 'NULL';
-			}
 		}
 	}
 });
+
+function fixTz(date) {
+	var  midDay = new Date(date.getTime());
+	midDay.setHours(12, 0, 0, 0);
+
+	// TODO: Read time zone from db configuration
+	var tz = {timeZone: 'Europe/Madrid'};
+	return new Date(midDay.toLocaleString('en-US', tz));
+}
diff --git a/js/vn/date.js b/js/vn/date.js
index 78691d87..f57aaacd 100644
--- a/js/vn/date.js
+++ b/js/vn/date.js
@@ -2,14 +2,13 @@
  * Date handling utilities.
  **/
 
-Date.prototype.clone = function ()
-{
-	return new Date (this.getTime ());
+Date.prototype.clone = function() {
+	return new Date(this.getTime());
 }
 
 module.exports =
 {
-	 WDays:
+	WDays:
 	[
 		 'Sunday'
 		,'Monday'
@@ -62,66 +61,63 @@ module.exports =
 	
 	,tokenD: '%A, %B %e'
 	
-	,regexp: new RegExp ('%[a-zA-Z]', 'g')
+	,regexp: new RegExp('%[a-zA-Z]', 'g')
 
-	,pad: function (number)
-	{
+	,pad: function(number) {
 		if (number < 10)
-			return '0'+ number.toString ();
+			return '0'+ number.toString();
 
-		return number.toString ();
+		return number.toString();
 	}
 	
-	,regexpFunc: function (d, token)
-	{
-		switch (token.charAt (1))
-		{
+	,regexpFunc: function(d, token) {
+		switch (token.charAt(1)) {
 			// Minutes with 2 digits
-			case 'M': return this.pad (d.getMinutes ());
+			case 'M': return this.pad(d.getMinutes());
 
 			// Hour with 2 digits in 24 hour format
-			case 'H': return this.pad (d.getHours ());
+			case 'H': return this.pad(d.getHours());
 
 			// Complete time
-			case 'T': return d.toLocaleTimeString ();
+			case 'T': return d.toLocaleTimeString();
 
 			// Complete week day name
-			case 'A': return _(this.WDays[d.getDay ()]);
+			case 'A': return _(this.WDays[d.getDay()]);
 
 			// Abreviated week day name
-			case 'a': return _(this.AbrWDays[d.getDay ()]);
+			case 'a': return _(this.AbrWDays[d.getDay()]);
 
 			// Day of month with 2 digits
-			case 'd': return this.pad (d.getDate ());
+			case 'd': return this.pad(d.getDate());
 
 			// Day of month
-			case 'e': return d.getDate ();
+			case 'e': return d.getDate();
 
 			// Complete month name
-			case 'B': return _(this.Months[d.getMonth ()]);
+			case 'B': return _(this.Months[d.getMonth()]);
 
 			// Abreviated month name
-			case 'b': return _(this.AbrMonths[d.getMonth ()]);
+			case 'b': return _(this.AbrMonths[d.getMonth()]);
 
 			// Month number with 2 digits
-			case 'm': return this.pad (d.getMonth () + 1);
+			case 'm': return this.pad(d.getMonth() + 1);
 
 			// Year with 4 digits
-			case 'Y': return d.getFullYear ();
+			case 'Y': return d.getFullYear();
 
 			// Complete date without year
-			case 'D': return _(this.tokenD).replace (this.regexp, this.regexpFunc.bind (this, d));
+			case 'D': return _(this.tokenD).replace(this.regexp, this.regexpFunc.bind(this, d));
 		}
 		
 		return token;
 	}
 
-	,strftime: function (date, format)
-	{
+	,strftime: function(date, format) {
 		if (!date)
 			return '';
+		if (!(date instanceof Date))
+			date = new Date(date);
 
-		return format.replace (this.regexp, this.regexpFunc.bind (this, date));
+		return format.replace(this.regexp, this.regexpFunc.bind(this, date));
 	}
 };
-
diff --git a/package.json b/package.json
index 91e00da1..74398542 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "hedera-web",
-  "version": "1.407.12",
+  "version": "1.407.13",
   "description": "Verdnatura web page",
   "license": "GPL-3.0",
   "repository": {
diff --git a/rest/core/query.php b/rest/core/query.php
index 998e1d5a..a188e300 100644
--- a/rest/core/query.php
+++ b/rest/core/query.php
@@ -163,10 +163,10 @@ class Query extends Vn\Web\JsonRequest {
 	 * Transforms the database value into a JSON parseable value.
 	 **/
 	function castValue($value, $type) {
-		if ($value == '' && $type != Type::STRING)
+		if ($value === '' && $type != Type::STRING)
 			$value = NULL;
 
-		if (!empty($value))
+		if ($value !== NULL)
 		switch ($type) {
 			case Type::BOOLEAN:
 				return (bool) $value;