diff --git a/api-webapp/pom.xml b/api-webapp/pom.xml
index 4d46cab..8281356 100644
--- a/api-webapp/pom.xml
+++ b/api-webapp/pom.xml
@@ -144,6 +144,12 @@
             <artifactId>jakarta.mail</artifactId>
             <version>1.6.7</version>
         </dependency>
+        <!-- utils -->
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.12.0</version>
+        </dependency>
         <!-- auth -->
         <dependency>
             <groupId>org.pac4j</groupId>
diff --git a/view-webapp/src/main/kotlin/org/jeudego/pairgoth/view/TranslationTool.kt b/view-webapp/src/main/kotlin/org/jeudego/pairgoth/view/TranslationTool.kt
index e3937d9..2c0fd63 100644
--- a/view-webapp/src/main/kotlin/org/jeudego/pairgoth/view/TranslationTool.kt
+++ b/view-webapp/src/main/kotlin/org/jeudego/pairgoth/view/TranslationTool.kt
@@ -21,6 +21,14 @@ class TranslationTool {
         }.let { Pair(iso, it) }
     }
 
+    val defaultCountry = Translator.providedLanguages.associate { iso ->
+        when (iso) {
+            "en" -> "gb"
+            "zh" -> "cn"
+            else -> iso
+        }.let { Pair(iso, it) }
+    }
+
     fun url(request: HttpServletRequest, lang: String): String {
         val out = StringBuilder()
         out.append(request.requestURL.replaceFirst(Regex("://"), "://$lang/"))
@@ -29,7 +37,12 @@ class TranslationTool {
         return out.toString()
     }
 
+    fun datepickerLocale(language: String, locale: String) =
+        if (datepickerLocales.contains(locale)) locale
+        else language
+
     companion object {
+        val datepickerLocales = setOf("ar-DZ", "ar", "ar-TN", "az", "bg", "bm", "bn", "br", "bs", "ca", "cs", "cy", "da", "de", "el", "en-AU", "en-CA", "en-GB", "en-IE", "en-NZ", "en-ZA", "eo", "es", "et", "eu", "fa", "fi", "fo", "fr-CH", "fr", "gl", "he", "hi", "hr", "hu", "hy", "id", "is", "it-CH", "it", "ja", "ka", "kk", "km", "ko", "lt", "lv", "me", "mk", "mn", "mr", "ms", "nl-BE", "nl", "no", "oc", "pl", "pt-BR", "pt", "ro", "ru", "si", "sk", "sl", "sq", "sr", "sr-latn", "sv", "sw", "ta", "tg", "th", "tk", "tr", "uk", "uz-cyrl", "uz-latn", "vi", "zh-CN", "zh-TW")
         val translator = ThreadLocal<Translator>()
     }
 }
\ No newline at end of file
diff --git a/view-webapp/src/main/kotlin/org/jeudego/pairgoth/web/LanguageFilter.kt b/view-webapp/src/main/kotlin/org/jeudego/pairgoth/web/LanguageFilter.kt
index 80abcef..2581309 100644
--- a/view-webapp/src/main/kotlin/org/jeudego/pairgoth/web/LanguageFilter.kt
+++ b/view-webapp/src/main/kotlin/org/jeudego/pairgoth/web/LanguageFilter.kt
@@ -2,8 +2,10 @@ package org.jeudego.pairgoth.web
 
 import org.jeudego.pairgoth.util.Translator
 import org.jeudego.pairgoth.util.Translator.Companion.defaultLanguage
+import org.jeudego.pairgoth.util.Translator.Companion.defaultLocale
 import org.jeudego.pairgoth.util.Translator.Companion.providedLanguages
 import org.jeudego.pairgoth.view.TranslationTool
+import java.util.*
 import javax.servlet.Filter
 import javax.servlet.FilterChain
 import javax.servlet.FilterConfig
@@ -29,52 +31,56 @@ class LanguageFilter : Filter {
             return
         }
 
+        val match = langPattern.matchEntire(uri)
+        val askedLanguage = match?.groupValues?.get(1)
+        val target = match?.groupValues?.get(2) ?: uri
+
         val reqLang = request.getAttribute("lang") as String?
         if (reqLang != null) {
+            // this is a forwarded request, language and locale should already have been set
             TranslationTool.translator.set(Translator.getTranslator(reqLang))
             chain.doFilter(request, response)
         } else {
-            val match = langPattern.matchEntire(uri)
-            val lang = match?.groupValues?.get(1)
-            val target = match?.groupValues?.get(2) ?: uri
-
-            if (lang != null && providedLanguages.contains(lang)) {
+            val (preferredLanguage, preferredLocale) = parseLanguageHeader(request)
+            if (askedLanguage != null && providedLanguages.contains(askedLanguage)) {
                 // the target URI contains a language we provide
-                request.setAttribute("lang", lang)
+                request.setAttribute("lang", askedLanguage)
+                request.setAttribute("loc",
+                    if (askedLanguage == preferredLanguage) preferredLocale
+                    else askedLanguage
+                )
                 request.setAttribute("target", target)
                 filterConfig!!.servletContext.getRequestDispatcher(target).forward(request, response)
             } else {
                 // the request must be redirected
-                val preferredLanguage = getPreferredLanguage(request)
-                val destination = if (lang != null) target else uri
+                val destination = if (askedLanguage != null) target else uri
                 response.sendRedirect("/${preferredLanguage}${destination}")
             }
         }
     }
 
-    private fun getPreferredLanguage(request: HttpServletRequest): String {
-        var lang = request.session.getAttribute("lang") as String?
-        if (lang == null) {
-            parseLanguageHeader(request)
-            lang = request.session.getAttribute("lang") as String?
-        }
-        return lang ?: defaultLanguage
-    }
-
-    private fun parseLanguageHeader(request: HttpServletRequest) {
+    /**
+     * Returns Pair(language, locale)
+     */
+    private fun parseLanguageHeader(request: HttpServletRequest): Pair<String, String> {
         langHeaderParser.findAll(request.getHeader("Accept-Language") ?: "").filter {
             providedLanguages.contains(it.groupValues[1])
         }.sortedByDescending {
             it.groupValues[3].toDoubleOrNull() ?: 1.0
-        }.firstOrNull()?.let {
-            it.groupValues[1]
+        }.firstOrNull()?.let { match ->
+            val lang = match.groupValues[1].let { if (it == "*") defaultLanguage else it }
+            val variant = match.groupValues.getOrNull(2)?.lowercase(Locale.ROOT)
+            // by convention, the variant is only kept if different from the language (fr-FR => fr)
+            val locale = variant?.let { if (lang == variant) lang else "$lang-${variant.uppercase(Locale.ROOT)}" } ?: lang
+            return Pair(lang, locale)
         }
+        return Pair(defaultLanguage, defaultLanguage)
     }
 
     override fun destroy() {}
 
     companion object {
         private val langPattern = Regex("/([a-z]{2})(/.+)")
-        private val langHeaderParser = Regex("(?:\\b(\\*|[a-z]{2})(?:(?:_|-)\\w+)?)(?:;q=([0-9.]+))?") ADD locale group captue
+        private val langHeaderParser = Regex("(?:\\b(\\*|[a-z]{2})(?:(?:_|-)(\\w+))?)(?:;q=([0-9.]+))?")
     }
 }
diff --git a/view-webapp/src/main/webapp/WEB-INF/layouts/standard.html b/view-webapp/src/main/webapp/WEB-INF/layouts/standard.html
index bdfdd80..662700e 100644
--- a/view-webapp/src/main/webapp/WEB-INF/layouts/standard.html
+++ b/view-webapp/src/main/webapp/WEB-INF/layouts/standard.html
@@ -70,6 +70,7 @@
   <link rel="stylesheet" href="/css/main.css"/>
   <script type="text/javascript">
     const lang = '${request.lang}';
+    const locale = '${request.locale}';
     // #[[
     onLoad(() => {
       $('#lang').on('click', e => {
diff --git a/view-webapp/src/main/webapp/WEB-INF/tools.xml b/view-webapp/src/main/webapp/WEB-INF/tools.xml
index 3676d06..811a5d3 100644
--- a/view-webapp/src/main/webapp/WEB-INF/tools.xml
+++ b/view-webapp/src/main/webapp/WEB-INF/tools.xml
@@ -3,11 +3,11 @@
 
     <toolbox scope="application">
         <tool key="translate" class="org.jeudego.pairgoth.view.TranslationTool"/>
+        <tool key="strings" class="org.apache.commons.lang3.StringUtils"/>
         <!--
         <tool key="number" format="#0.00"/>
         <tool key="date" locale="fr_FR" format="yyyy-MM-dd"/>
         <tool key="inflector" class="org.atteo.evo.inflector.English"/>
-        <tool key="strings" class="org.apache.commons.lang3.StringUtils"/>
         -->
     </toolbox>
 
diff --git a/view-webapp/src/main/webapp/lib/datepicker-1.3.4/locales/ar-tn.js b/view-webapp/src/main/webapp/lib/datepicker-1.3.4/locales/ar-TN.js
similarity index 100%
rename from view-webapp/src/main/webapp/lib/datepicker-1.3.4/locales/ar-tn.js
rename to view-webapp/src/main/webapp/lib/datepicker-1.3.4/locales/ar-TN.js
diff --git a/view-webapp/src/main/webapp/tour.html b/view-webapp/src/main/webapp/tour.html
index 518110f..28ab37e 100644
--- a/view-webapp/src/main/webapp/tour.html
+++ b/view-webapp/src/main/webapp/tour.html
@@ -1,4 +1,5 @@
-#macro(toHMS $value)#if($value)#set($hh = $value / 3600)#set($mm = ($value - $hh) / 60)#set($ss = $value % 60)$hh:$mm:$ss#end#end
+#macro(twoDigits $value)$strings.leftPad($value, 2, '0')#end
+#macro(toHMS $value)#if($value)#set($hh = $value / 3600)#set($mm = ($value % 3600) / 60)#set($ss = $value % 60)#twoDigits($hh):#twoDigits($mm):#twoDigits($ss)#end#end
 #macro(levels $sel)
   #foreach($d in [8..0])
     #set($dan = $d + 1)
@@ -37,19 +38,20 @@
           <label>Dates</label>
           <span id="date-range">
           from
-          <input type="date" name="startDate" required class="date" placeholder="start date" #if($tour) value="$tour.startDate" #end/>
+          <input type="text" name="startDate" required class="date" placeholder="start date" #if($tour) value="$tour.startDate" #end/>
           to
-          <input type="date" name="endDate" required class="date" placeholder="end date" #if($tour) value="$tour.startDate" #end/>
+          <input type="text" name="endDate" required class="date" placeholder="end date" #if($tour) value="$tour.startDate" #end/>
         </span>
         </div>
       </div>
       <div class="two stackable fields">
         <div class="seven wide field">
           <label>Country</label>
-          <select name="country">
+          <select name="country" placeholder="country">
             <option></option>
+#set($defaultCountry = $translate.defaultCountry[$request.lang])
 #foreach($country in $countries.countries)
-            <option value="$country.key" #if($tour && $country.key == $tour.country || !$tour && $country.key == $request.lang) selected #end>$country.value</option>
+            <option value="$country.key" #if($tour && $country.key == $tour.country || !$tour && $country.key == $defaultCountry) selected #end>$country.value</option>
 #end
           </select>
         </div>
@@ -216,24 +218,29 @@
 #if($tour)
   const tour_id = ${tour.id};
 #end
-  // #[[
+#set($datepickerLocale = $translate.datepickerLocale($request.lang, $request.loc))
+  const datepickerLocale = '$datepickerLocale';
+  // #[[ale
   const safeRegex = /^[-a-zA-Z0-9_.]+$/;
   function parseDate(value) {
-    return value;
-    /*
-    let locale = Datepicker.locales[lang];
-    if (locale) {
-      let date = Datepicker.parseDate(value, locale.format, locale);
-      return Datepicker.formatDate(date, 'yyyy-mm-dd')
-    }
-    else return undefined;
-     */
+    let format = Datepicker.locales[datepickerLocale]?.format || 'mm/dd/yyyy';
+    let date = Datepicker.parseDate(value, format, datepickerLocale);
+    return Datepicker.formatDate(date, 'yyyy-mm-dd')
+  }
+  function formatDate(value) {
+    let format = Datepicker.locales[datepickerLocale]?.format || 'mm/dd/yyyy';
+    let date = Datepicker.parseDate(value, 'yyyy-mm-dd', datepickerLocale);
+    return Datepicker.formatDate(date, format)
   }
   function fromHMS(value) {
     if (value && /\d+:\d+:\d+/.test(value)) {
       let parts = value.split(':');
-      return parts[0] * 3600 + parts[1] * 60 + parts[2];
+      let seconds = parts[0] * 3600 + parts[1] * 60 + parts[2] * 1;
+      console.log(`${value} => ${seconds}`);
+      return seconds;
     }
+    console.log(`invalid hh:mm:ss value: ${value}`);
+    return 0;
   }
   onLoad(() => {
 
@@ -265,9 +272,15 @@
       if (!valid) return;
     });
 
+    for(let name of ['startDate', 'endDate']) {
+      let control = $(`input[name="${name}"]`)[0];
+      if (control.value) {
+        control.value = formatDate(control.value);
+      }
+    }
     new DateRangePicker($('#date-range')[0], {
       autohide: true,
-      language: lang
+      language: datepickerLocale || 'en'
     });
 
     $('input[name="online"]').on('change', e => {
@@ -361,13 +374,14 @@
       }
     });
   });
+
   // ]]#
 </script>
-<!--
-<script type="text/javascript" src="/lib/datepicker-1.3.3/datepicker-full.min.js"></script>
-<script type="text/javascript" src="/lib/datepicker-1.3.3/locales/${request.lang}.js"></script>
-<link rel="stylesheet" href="/lib/datepicker-1.3.3/datepicker.min.css">
--->
+<script type="text/javascript" src="/lib/datepicker-1.3.4/datepicker-full#*.min*#.js"></script>
+#if($datepickerLocale != 'en')
+<script type="text/javascript" src="/lib/datepicker-1.3.4/locales/${datepickerLocale}.js"></script>
+#end
+<link rel="stylesheet" href="/lib/datepicker-1.3.4/datepicker.min.css">
 <style type="text/css">
     .ui.form input[type=checkbox][name=online] {
         vertical-align: initial;