<xan> davidz: shell master, open calendar, click 'next' on the month thingie, it jumps to March
 <xan> going back works ok, goes to february and then january
  and if after that you try to go forward it works ok too
 --> jg (~jg@c-98-229-99-32.hsd1.ma.comcast.net) has joined #fedora-desktop
 <davidz> xan: oh, fun
  xan: it does that because there is no February 31 :-)
  the question is what it should be doing...
  (probably not what it is doing right now)
 <drago01> go to the 28
  st
 <davidz> maybe
  (probably even)
 <xan> seems like the most sensible thing to do, yeah

This is probably due to how the Date class works, relevant code:

    _onPrevMonthButtonClicked: function() {
        let newDate = new Date(this._selectedDate);
        if (newDate.getMonth() == 0) {
            newDate.setMonth(11);
            newDate.setFullYear(newDate.getFullYear() - 1);
        } else {
            newDate.setMonth(newDate.getMonth() - 1);
        }
        this.setDate(newDate);
   },

    _onNextMonthButtonClicked: function() {
        let newDate = new Date(this._selectedDate);
        if (newDate.getMonth() == 11) {
            newDate.setMonth(0);
            newDate.setFullYear(newDate.getFullYear() + 1);
        } else {
            newDate.setMonth(newDate.getMonth() + 1);
        }
        this.setDate(newDate);
    },