From 06e113919fb1cff5c6a54ca4215b89aadc49802d Mon Sep 17 00:00:00 2001
From: Nikola Kovacs <nikola.kovacs@gmail.com>
Date: Wed, 10 Feb 2016 13:30:21 +0100
Subject: [PATCH] Fix locale inconsistencies between intl and moment

The month names used by moment are different than the ones
in intl, leading to validation errors.
Get the month and weekday names from intl, and patch
the moment locale to use those.
---
 DateTimePicker.php  | 20 ++++++++++++++++
 LocaleConverter.php | 56 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 LocaleConverter.php

diff --git a/DateTimePicker.php b/DateTimePicker.php
index 19ffc6b..341be7c 100644
--- a/DateTimePicker.php
+++ b/DateTimePicker.php
@@ -187,9 +187,29 @@ protected function registerLocale($view)
         if ($file === false) {
             return;
         }
+
         $view->registerJsFile(Yii::$app->assetManager->publish($file)[1], [
             'depends' => '\nkovacs\datetimepicker\MomentAsset',
         ]);
+
+        // use the same strings intl uses, to avoid validation errors.
+        if (extension_loaded('intl')) {
+            $weekdays = LocaleConverter::getWeekdays('EEEE', $this->locale); // dddd
+            $weekdaysShort = LocaleConverter::getWeekdays('EEE', $this->locale); // ddd
+            $weekdaysMin = LocaleConverter::getWeekdays('EEEEEE', $this->locale); // dd
+            $months = LocaleConverter::getMonths('MMMM', $this->locale);
+            $monthsShort = LocaleConverter::getMonths('MMM', $this->locale);
+            $override = Json::encode([
+                'months' => $months,
+                'monthsShort' => $monthsShort,
+                'weekdays' => $weekdays,
+                'weekdaysShort' => $weekdaysShort,
+                'weekdaysMin' => $weekdaysMin,
+            ]);
+            // POS_END is the default for js files.
+            $view->registerJs("moment.locale('$locale', $override)", \yii\web\View::POS_END);
+        }
+
         $this->clientOptions['locale'] = $locale;
     }
 
diff --git a/LocaleConverter.php b/LocaleConverter.php
new file mode 100644
index 0000000..478236f
--- /dev/null
+++ b/LocaleConverter.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace nkovacs\datetimepicker;
+
+use Yii;
+use IntlDateFormatter;
+
+class LocaleConverter
+{
+    protected static $cache = [];
+
+    public static function getMonths($format, $locale = null) {
+        if ($locale === null) {
+            $locale = Yii::$app->language;
+        }
+
+        if (!isset(static::$cache['months'][$locale][$format])) {
+            $formatter = new IntlDateFormatter($locale, IntlDateFormatter::NONE, IntlDateFormatter::NONE, Yii::$app->timeZone, null, $format);
+            $localized = [];
+            for ($month = 0; $month < 12; $month++) {
+                $localized[] = $formatter->format([
+                    'tm_sec' => 0,
+                    'tm_min' => 0,
+                    'tm_hour' => 12,
+                    'tm_mday' => 15,
+                    'tm_mon' => $month,
+                    'tm_year' => 2016,
+                ]);
+            }
+            static::$cache['months'][$locale][$format] = $localized;
+        }
+        return static::$cache['months'][$locale][$format];
+    }
+
+    public static function getWeekdays($format, $locale = null) {
+        if ($locale === null) {
+            $locale = Yii::$app->language;
+        }
+        if (!isset(static::$cache['weekdays'][$locale][$format])) {
+            $formatter = new IntlDateFormatter($locale, IntlDateFormatter::NONE, IntlDateFormatter::NONE, Yii::$app->timeZone, null, $format);
+            $localized = [];
+            for ($day = 0; $day < 7; $day++) {
+                $localized[] = $formatter->format([
+                    'tm_sec' => 0,
+                    'tm_min' => 0,
+                    'tm_hour' => 12,
+                    'tm_mon' => 6,
+                    'tm_year' => 2016,
+                    'tm_mday' => 2 + $day, // 2016-06-02 is a sunday
+                ]);
+            }
+            static::$cache['weekdays'][$locale][$format] = $localized;
+        }
+        return static::$cache['weekdays'][$locale][$format];
+    }
+}