OKRF23-87 Set default date to the last date we have data for.

src/blocks/OldDateIndicatorWarning.svelte

@@ -0,0 +1,25 @@
+<script>
+  import { formatDateYearDayOfWeekAbbr } from '../formats';
+
+  /**
+   * @type {import('../stores/params').SensorParam}
+   */
+  export let sensor;
+  /**
+   * @type {import("../stores/params").DateParam}
+   */
+  export let date;
+
+  const currDate = new Date();
+
+  function datesEqual(date) {
+    return date.value == currDate;
+  }
+</script>
+
+{#if !datesEqual(date)}
+  <div data-uk-alert class="uk-alert-warning">
+    The indicator "{sensor.name}" is not available for {formatDateYearDayOfWeekAbbr(currDate)}, yet. The latest known
+    data is available on {formatDateYearDayOfWeekAbbr(date.value)}.
+  </div>
+{/if}

src/blocks/RegionMapWrapper.svelte

@@ -4,6 +4,7 @@
   import RegionHexMap from './RegionHexMap.svelte';
   import RegionMap from './RegionMap.svelte';
   import Toggle from '../components/Toggle.svelte';
+  import OldDateIndicatorWarning from './OldDateIndicatorWarning.svelte';
 
   /**
    * @type {import("../../stores/params").DateParam}
@@ -26,8 +27,13 @@
 
   $: hasCounties = sensor.value.levels.includes('county');
   let showChoropleth = false;
+
+  $: if (sensor.timeFrame.max < date.value) {
+    date.set(sensor.timeFrame.max);
+  }
 </script>
 
+<OldDateIndicatorWarning {sensor} {date} />
 {#if region.level === 'nation'}
   <p class="uk-text-center uk-text-italic ux-hint">
     <span class="inline-svg-icon">