The date and time format displayed by AppColl can be set for the entire account or on a per-user basis. Please note this can only be done by an Account Administrator.

AppColl supports dates in the form year-month-day, day-month-year and month-day-year. The month and day can be spelled out if desired. Times can be displayed in 12- or 24-hour formats. Some examples:

2017-10-23 2:34 PM
Mon Oct 23 2017 14:34
Mon 23/10/2017 2:34 PM

Note: these settings do not affect the format of dates in exported CSV files, which will always be in YYYY-MM-DD format to prevent incorrect interpretation by programs reading the CSV file, such as Microsoft Excel.

To change the format, click the Settings link in the far upper-right corner of any page. Scroll to the "Date & Time Format" section. 

Select the "Allow user to override..." checkbox to permit users to set their own formats in their profile page, accessed using the "Your Profile" link next to the Settings link.