Error when loading Preferences dialog.

[fishnet37222]

I installed this extension in Ubuntu 18.10 using the Gnome Extensions web-site. When I tried to open the Preferences dialog in Gnome Tweak Tool to customize the format, I got the following error message and stack trace.

TypeError: (new Date(...)).toLocaleFormat is not a function

Stack trace:
  dateTimeFormat@/home/dave/.local/share/gnome-shell/extensions/[email protected]/Utilities.js:15:85
  updatePreview@/home/dave/.local/share/gnome-shell/extensions/[email protected]/FormatTarget.js:49:25
  create@/home/dave/.local/share/gnome-shell/extensions/[email protected]/FormatTarget.js:55:2
  buildPrefsWidget/<@/home/dave/.local/share/gnome-shell/extensions/[email protected]/prefs.js:136:61
  buildPrefsWidget@/home/dave/.local/share/gnome-shell/extensions/[email protected]/prefs.js:136:2
  _selectExtension@resource:///org/gnome/shell/extensionPrefs/main.js:83:22
  wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
  _onCommandLine@resource:///org/gnome/shell/extensionPrefs/main.js:235:17
  wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22
  main@resource:///org/gnome/shell/extensionPrefs/main.js:389:5
  @<main>:1:43

[christofferholmstedt]

Same issue as for Fedora see #13, not completely fixed but it is a good start with the changes from @danieljrmay

I just installed Ubuntu 18.10 and got the same error. Clone the changes from https://github.com/danieljrmay/datetime-format and now the settings page works at least.