I assume Mozilla's priorities still lie on other features. At least bug 1069609 has a [detailed UX specification](https://bug1069609.bmoattachments.org/attachment.cgi?id=8826546) including month and week pickers. While that spec. is already quite old itself, it seems to lay a good foundation for someone, who wants to implement it. The main code for the widget is here: https://searchfox.org/mozilla-central/rev/43ed185f20ba4d3ef28c78b85102ea88fa63c947/toolkit/content/widgets/datetimebox.js. Sebastian
Bug 1283382 Comment 9 Edit History
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I assume Mozilla's priorities still lie on other features. At least bug 1069609 has a [detailed UX specification](https://bug1069609.bmoattachments.org/attachment.cgi?id=8826546) including month and week pickers. While that spec. is already quite old itself, it seems to lay a good foundation for someone, who wants to implement it. The main code for the date widget is here: https://searchfox.org/mozilla-central/rev/43ed185f20ba4d3ef28c78b85102ea88fa63c947/toolkit/content/widgets/datetimebox.js. Sebastian