If the opportunity is not in a workflow, the 3 calendar icons for the workflow will display the letter N. If the opportunity is in a workflow, the calendars will display dots instead (for undefined dates) or the day of the date.

Dates that are past today's date are in red. The start date of the workflow map will always be white.

Today's dates are in purple.

The dates of tomorrow are in yellow.

Dates that are later than tomorrow are white (the start date is always white).