According to the HKSAR Census and Statistic Department:
the unemployed population comprises all unemployed persons. For a person aged 15 or over to be classified as unemployed, that person should :
(a) not have had a job and should not have performed any work for pay or profit during the 7 days before enumeration; and
(b) have been available for work during the 7 days before enumeration; and
(c) have sought work during the 30 days before enumeration.
*Note that different countries have slightly different definitions.