How to get Weekends marked on the DAY timeline, OR have the day of the week on the DAY timeline

[Michael Ussher]

I have the bands showing up with:

bandIntervals: [
 Timeline.DateTime.DAY,
 Timeline.DateTime.MONTH
]

but on the DAY timeline the date is formatted '2 Jan' so its unclear which days are weekdays and which are weekends.

How can I either get the weekend highlighting on on the DAY timeline, or have the date format as 'Tue, 2 Jan'.

Thanks.