8th December 2018 From India, Bangalore
Attrition is of two types viz., voluntary and involuntary. The cases of absconding, resignation you mentioned belong to the voluntary attrition while the other one of by termination at the instance of the employer belongs to the involuntary one. Yet another one coming to the natural termination of employment like retirement on attaining the age of superannuation.
Whatever its type be, the effective date is the actual date of separation on account of the termination of the contract of employment. In the case of resignation, it is the exact date of formal relief and not the date of submitting resignation or the effective date mentioned therein for the reason its acceptance can be postponed by the employer or the employee may withdraw it before it is accepted.
8th December 2018 From India, Salem