This application displayes your photos in a calendar. By switching month you are able to go back in time and view all your photos.
Touching a day with a photo opens up a gallery with all photos taken that specific day.
The calendar loads a thumbnail for each day of the month. If the thumbnail do not exist, it is created by the system, this might take some time the first time.
Use settings to select if your week starts with a Sunday, otherwise Monday will be used.