Returns the time the associated {@code Session} started (was created).
@param key the session key to use to look up the target session.
@return the time the specified {@code Session} started (was created).
@see hunt.shiro.session.Session#getStartTimestamp()
Returns the time the associated {@code Session} started (was created).
@param key the session key to use to look up the target session. @return the time the specified {@code Session} started (was created). @see hunt.shiro.session.Session#getStartTimestamp()