[1] DST starting and ending dates were variable and determined by decree, often set for only one year at a time.
In 1997, the DST starting date was set to a Monday due to the Pope's mass on Sunday during his visit to Brazil.
[2] In 2002, 2004 and 2006, the starting date was postponed to the first Sunday or holiday in November due to elections in October and technical difficulties in adjusting the internal clocks of electronic voting machines.
[1] From 1988, DST was typically limited to the South, Southeast and Central-West regions, and was occasionally extended to some other states such as Bahia and Tocantins.
[1] In 2000, DST was extended to all states in the Northeast region but was quickly canceled in most of them due to strong local opposition.