Checks if the duration of the unit is an estimate.
!(p)
All units have a duration, however the duration is not always accurate.
For example, days have an estimated duration due to the possibility of
daylight saving time changes.
This method returns true if the duration is an estimate and false if it is
accurate. Note that accurate/estimated ignores leap seconds.
@return true if the duration is estimated, false if accurate
Checks if the duration of the unit is an estimate. !(p) All units have a duration, however the duration is not always accurate. For example, days have an estimated duration due to the possibility of daylight saving time changes. This method returns true if the duration is an estimate and false if it is accurate. Note that accurate/estimated ignores leap seconds.
@return true if the duration is estimated, false if accurate