Calendar display not always updated

[donaldali]

When the next lesson is on the 31st of a future month, the calender display remains on the current month.
For example, if the current day is June 29 and the next lesson is July 31 or August 31, the calendar displayed remains June. If, however, the next lesson is any other day in July or August, the calendar displayed is for the month of July (as expected).