Time range is used in daily and weekly calendar element. It defines the range of hours for the calendar element. By default it is set to 6AM to 9PM.
User can change the time range in AJournal "Settings".
When you save the setting, it might ask you whether you want to save the setting for today or the date you are currently on (only ask when the current date is not today). After saving the setting, it is only valid for the date later than that date. So if you want to apply the setting to past, please change the date in "Day" or "Week" mode and then open the "Settings" form.
In current version, the time range is not used for the monthly calendar element.
If user wants to use a special time range for some templates, please create a user template with daily or weekly calendar element and configure that calendar element with customised time range. It is useful if user want to use different time range for weekday and weekend.