Range selection slider for month-end dates

The DateRangeSlider widget apparently only allows daily date selection options. I’m looking for the ability to select a range of monthly dates (e.g. 2015-12 to 2018-02, or even 2015-12-31 to 2018-02-28 but only month-end dates). Do I need to create my own widget for this?

I know it’s been a long time… but I just have the same question and found a solution using JS callback here: https://stackoverflow.com/questions/60324426/how-to-realize-1-month-step-in-bokeh-daterangeslider

Thank you for the pointer - it does look like a tricky solution, but I will see if I can get it to work!