Why are some dates red on the Calendar views?

cal out of range

When using the Calendar views of the Schedule tab, there is a chance that some of the dates displayed will be colored Red. This indicates that those days are outside the date range applied via the date-range dropdown. Any Shifts on days outside the range will not be displayed, but you can still create and add Shifts on those dates. If you add a Shift on a day outside the applied date range, that Shift will not appear until you change the date-range dropdown to include them.