My item type have 4 different stage in life cycle,How could I get the change time between different stage ?
it depends. For certain change ItemTypes the available properties can already store this information:
- e.g. created_on --> may tell you about state 'New'
- or released_on --> set when state = 'Completed'
These properties of course doesn´t cover all states you may have.. In this case, maybe the history would offer a better overview. You could use a custom history where you just log the promote actions.