Add monthly view to a GANTT Chart

It seems to me that the only thing that is different for a monthly view is the labels in row 5. This is difficult for months because every month has a different number of days. If we put the month name in one column, the column is too narrow.

I have provided solution that puts the month name vertically on the first day of the month and uses conditional formatting to draw a box around the month. The borders around the day-of-month number still show the weeks. This can be changed if desired.