Fix human date on iOS devices (#510)

package.json

@@ -21,7 +21,6 @@
     "autoprefixer": "^10.4.14",
     "codemirror": "^6.0.1",
     "cssnano": "^5.1.15",
-    "dayjs": "^1.11.9",
     "github-markdown-css": "^5.5.0",
     "highlight.js": "^11.11.1",
     "jdenticon": "^3.3.0",