diff --git a/src/components/CalendarPane.vue b/src/components/CalendarPane.vue
index 18c43503a..8da19c611 100755
--- a/src/components/CalendarPane.vue
+++ b/src/components/CalendarPane.vue
@@ -390,7 +390,7 @@ export default {
       const key = `${year.toString()}.${month.toString()}`;
       let page = this.pages.find(p => (p.key === key));
       if (!page) {
-        const date = new Date(year, month - 1, 1);
+        const date = new Date(year, month - 1, 15);
         const monthComps = getMonthComps(month, year);
         const prevMonthComps = getPrevMonthComps(month, year);
         const nextMonthComps = getNextMonthComps(month, year);
diff --git a/src/utils/helpers.js b/src/utils/helpers.js
index edbeec366..741a23ea1 100755
--- a/src/utils/helpers.js
+++ b/src/utils/helpers.js
@@ -15,7 +15,7 @@ export const todayComps = {
 export const getMonthDates = (year = 2000) => {
   const dates = [];
   for (let i = 0; i < 12; i++) {
-    dates.push(new Date(year, i, 1));
+    dates.push(new Date(year, i, 15));
   }
   return dates;
 };
diff --git a/src/utils/locales.js b/src/utils/locales.js
index 80e78e4b9..4092219c9 100644
--- a/src/utils/locales.js
+++ b/src/utils/locales.js
@@ -9,9 +9,9 @@ const locales = {
   // Catalan
   ca: { dow: 2, L: 'DD/MM/YYYY' },
   // Chinese (China)
-  'zh-cn': { dow: 2, L: 'YYYY/MM/DD' },
+  'zh-CN': { dow: 2, L: 'YYYY/MM/DD' },
   // Chinese (Taiwan)
-  'zh-tw': { L: 'YYYY/MM/DD' },
+  'zh-TW': { L: 'YYYY/MM/DD' },
   // Croatian
   hr: { dow: 2, L: 'DD.MM.YYYY' },
   // Czech
@@ -21,17 +21,17 @@ const locales = {
   // Dutch
   nl: { dow: 2, L: 'DD.MM.YYYY' },
   // English (US)
-  'en-us': { L: 'MM/DD/YYYY' },
+  'en-US': { L: 'MM/DD/YYYY' },
   // English (Australia)
-  'en-au': { dow: 2, L: 'DD/MM/YYYY' },
+  'en-AU': { dow: 2, L: 'DD/MM/YYYY' },
   // English (Canada)
-  'en-ca': { L: 'YYYY-MM-DD' },
+  'en-CA': { L: 'YYYY-MM-DD' },
   // English (Great Britain)
-  'en-gb': { dow: 2, L: 'DD/MM/YYYY' },
+  'en-GB': { dow: 2, L: 'DD/MM/YYYY' },
   // English (Ireland)
-  'en-ie': { dow: 2, L: 'DD-MM-YYYY' },
+  'en-IE': { dow: 2, L: 'DD-MM-YYYY' },
   // English (New Zealand)
-  'en-nz': { dow: 2, L: 'DD/MM/YYYY' },
+  'en-NZ': { dow: 2, L: 'DD/MM/YYYY' },
   // Esperanto
   eo: { dow: 2, L: 'YYYY-MM-DD' },
   // Finnish
@@ -39,9 +39,9 @@ const locales = {
   // French
   fr: { dow: 2, L: 'DD/MM/YYYY' },
   // French (Canada)
-  'fr-ca': { L: 'YYYY-MM-DD' },
+  'fr-CA': { L: 'YYYY-MM-DD' },
   // French (Switzerland)
-  'fr-ch': { dow: 2, L: 'DD.MM.YYYY' },
+  'fr-CH': { dow: 2, L: 'DD.MM.YYYY' },
   // German
   de: { dow: 2, L: 'DD.MM.YYYY' },
   // Indonesian
@@ -73,8 +73,8 @@ const locales = {
   // Turkish
   tk: { dow: 2, L: 'DD.MM.YYYY' },
 };
-locales.en = locales['en-us'];
-locales.zh = locales['zh-cn'];
+locales.en = locales['en-US'];
+locales.zh = locales['zh-CN'];
 
 // Month and day names are derived from Intl.DateTimeFormat
 const getMonthNames = (locale, length) => {
@@ -88,7 +88,7 @@ const getDayNames = (locale, length) => {
 
 export default (locale, defaults) => {
   locale = locale || new Intl.DateTimeFormat().resolvedOptions().locale;
-  const searchLocales = [locale.toLowerCase(), locale.toLowerCase().substring(0, 2), 'en-us'];
+  const searchLocales = [locale, locale.substring(0, 2), 'en-US'];
   const matchKey = searchLocales.find(l => locales[l]);
   const matchValue = locales[matchKey];
   defaults.locale = matchKey;