Calendar view allows you to review upcoming events (birthdays and other reminders) that you have entered, edit them, or delete expired events.
You can open the Calendar view in two ways:
Each Calendar view has two modes - Month view and Year view.
Month view:
Year view:

Use the arrow buttons at the top of the calendar to navigate forward and backward by month (in Month view) or by year (in Year view).
To quickly return to the current month or year, click Go to Today button at the right top corner.
To switch back to the Contacts, click highlighted "< Back to Contacts" in the menu.
Birthdays are marked in red, while all other events in orange. Expired events are shown with a grey tag, and active events have lime tags. If an event's description is too long to display in the calendar, hover over it to see the full text in a tooltip.
By default, the Calendar view shows all the events within the selected time frame. However, the internal Calendar view includes an additional feature: it will filter only events for the contacts based on the selected group(s). If ALL CONTACTS is selected, no filtering is applied.
You can edit a selected event either by double-clicking on it, or using right-clicking and selecting Edit. This opens Reminder Editor window. To delete an event, use the Delete option from the right-click menu. If the event is associated with a contact that has an email, you can also choose to Send Email from the right-click menu.