You can customize the ACDSee Calendar to start each week on a specific day, to use a 12- or 24-hour clock format, and to use one of four date types when sorting files.
To Set the Calendar Pane Options:
Calendar Pane Options
| Date types | Database date | Sorts files in the Calendar pane based on the date stored in the ACDSee database. | 
| Date taken | Sorts files in the Calendar pane based on the EXIF date of each item. | |
| File modified date | Sorts files in the Calendar pane based on the last-modified date of each item. | |
| File created date | Sorts files in the Calendar pane based on the date each file was created on your computer. | |
| Filters | Apply Advanced File List Filters (excluding folders) | Filters the items displayed in the Calendar pane based on the current File List pane filter settings. | 
| Show image and media files only | Displays only image, audio, and video files in the Calendar pane. | |
| Start of week | Specifies the first day of each week in the Calendar pane. | |
| Clock formats | 12 hour | Uses a 12-hour clock in the Calendar pane. | 
| 24 hour | Uses a 24-hour clock in the Calendar pane. | |