Yes (Default) - the absolute value is calculated and displayed. It does not depend on the order in which the Start and End fields are specified.
Math.abs(Start Field - End Field) == Math.abs(And Field - Start Field)
No - calculates the time from the start date to the end date.
End field - Start field
If the end date is less than the start date, the time will be shown with a minus sign.
Selecting a work calendar for calculating time
If you have the “Time in status field/Timer/Stopwatch/SLA“(https://jibrok.atlassian.net/wiki/spaces/JBS/pages/513441810) plugin installed, then in the field settings, you will see the option to select the working calendar for which the time between dates will be calculated and settings for time formats (D13 +).
Several jql functions are available for the Time between dates field. The first thing you need to enable indexing for a field. To do this, specify the Search Template: "Time searcher" field in the settings. It is enabled by default. After changing the settings, you need to run reindex Jira.
JQL functions take the following parameters.
condition - one of the characters <, <=, => =,>. For example: ">".
time - time string corresponding to one of the patterns.