Use strftime since the UTC shenanigans don't work on IOS

package.json

@@ -12,12 +12,14 @@
     "@types/react": "^16.9.53",
     "@types/react-dom": "^16.9.8",
     "@types/react-plotly.js": "^2.2.4",
+    "@types/strftime": "^0.9.2",
     "node-sass": "4.14.1",
     "plotly.js": "^1.57.1",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",
     "react-plotly.js": "^2.5.0",
     "react-scripts": "4.0.0-next.98",
+    "strftime": "0.9.2",
     "typescript": "^4.1.2",
     "web-vitals": "^0.2.4"
   },

src/Components/Map/Map.tsx

@@ -3,6 +3,7 @@ import Plot from 'react-plotly.js';
 import { Data, Layout } from 'plotly.js';
 import {auroraDataToGraphData} from '../../repositories/auroraData';
 import MapStyle from './Map.module.scss';
+import strftime from 'strftime';
 
 interface iPlotState {
   data?: Data[];
@@ -95,10 +96,11 @@ export default class Map extends React.Component<{}, iPlotState> {
 
     if (!data || !lastUpdateAt) return (<div>loading</div>)
 
-    const date = new Date(lastUpdateAt)
-    const hours = ('0' + date.getUTCHours()).slice(-2)
-    const minutes = ('0' + date.getUTCMinutes()).slice(-2)
-    const seconds = ('0' + date.getUTCSeconds()).slice(-2)
+    const time = strftime(
+      '%R:%S',
+      new Date(lastUpdateAt)
+    )
+
 
     return (
       <div className={MapStyle.mapContainer}>
@@ -112,7 +114,7 @@ export default class Map extends React.Component<{}, iPlotState> {
         <div className={MapStyle.timelet}>
           Last update:
           { " " }
-          { hours }:{ minutes }:{ seconds } UTC
+          { time }
         </div>
       </div>
     );

yarn.lock

@@ -2151,6 +2151,11 @@
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-2.0.0.tgz#7036640b4e21cc2f259ae826ce843d277dad8cff"
   integrity sha512-RJJrrySY7A8havqpGObOB4W92QXKJo63/jFLLgpvOtsGUqbQZ9Sbgl35KMm1DjC6j7AvmmU2bIno+3IyEaemaw==
+"@types/strftime@^0.9.2":
+  version "0.9.2"
+  resolved "https://registry.yarnpkg.com/@types/strftime/-/strftime-0.9.2.tgz#d74d791da15ef7ce8db89055af6752750e6784c9"
+  integrity sha1-1015HaFe986NuJBVr2dSdQ5nhMk=
+
 "@types/tapable@*", "@types/tapable@^1.0.5":
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/@types/tapable/-/tapable-1.0.6.tgz#a9ca4b70a18b270ccb2bc0aaafefd1d486b7ea74"
@@ -13175,6 +13180,11 @@ stream-shift@^1.0.0:
   resolved "https://registry.yarnpkg.com/stream-shift/-/stream-shift-1.0.1.tgz#d7088281559ab2778424279b0877da3c392d5a3d"
   integrity sha512-AiisoFqQ0vbGcZgQPY1cdP2I76glaVA/RauYR4G4thNFgkTqr90yXTo4LYX60Jl+sIlPNHHdGSwo01AvbKUSVQ==
+strftime@0.9.2:
+  version "0.9.2"
+  resolved "https://registry.yarnpkg.com/strftime/-/strftime-0.9.2.tgz#bcca2861f29456d372aaf6a17811c8bc6f39f583"
+  integrity sha1-vMooYfKUVtNyqvaheBHIvG859YM=
+
 strict-uri-encode@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz#279b225df1d582b1f54e65addd4352e18faa0713"