Santarém time zone history
On standard time, clocks at Santarém run 39 minutes ahead of local mean solar time, the largest gap of the 8 zones in Brazil whose clocks run ahead of the sun. Daylight saving time was used in 4 years since 1970, last in 1988; under the current rules the clocks no longer change.
UTC−3
Standard time is UTC−3 all year under the current rules.
Summer time in 4 of 57 years since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| January 1, 1914 | Local mean time (UTC−3:38:48) replaced | UTC−4 | numeric only |
| Since 1970 | |||
| June 24, 2008 | Standard time forward 1 hour | UTC−3 | numeric only |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| 1931 | October 3 | not that year | 1 hour |
| 1932 | October 3 | April 1 | 1 hour |
| 1933 | not that year | April 1 | 1 hour |
| 1949 | December 1 | not that year | 1 hour |
| 1950 | December 1 | April 16 | 1 hour |
| 1951–1952 | 1 December, 00:00 | 1 April, 00:00 | 1 hour |
| 1953 | not that year | March 1 | 1 hour |
| 1963 | December 9 | not that year | 1 hour |
| 1964 | not that year | March 1 | 1 hour |
| 1965 | January 31, December 1 | April 1 | 1 hour |
| 1966–1967 | 1 November, 00:00 | 1 March, 01:00 | 1 hour |
| 1968 | not that year | March 1 | 1 hour |
Since 1970: the periods shared by 4 of 16 zones, listed on the Brazil page.
Also on UTC−3
Belém (Brazil), French Guiana, Araguaína (Brazil), Suriname, Fortaleza (Brazil), Bahia (Brazil), Maceió (Brazil), Recife (Brazil), São Paulo (Brazil) and Paraguay (nearest first; 19 more on the list of offsets).
Clocks next door since 1970
- Manaus (577 km): same time except 6,891 days in 1993, 1994 and 2008–2026; 1 hour behind today.
- Belém (718 km): usually 1 hour ahead; different on 6,765 days in 1985–1988 and 2008–2026; same time today.
- French Guiana (866 km): usually 1 hour ahead; different on 7,115 days in 1985–1988 and 2008–2026; same time today.
- Boa Vista (870 km): same time except 6,919 days in 1999, 2000 and 2008–2026; 1 hour behind today.
- Araguaína (909 km): usually 1 hour ahead; different on 7,912 days in 1985–1990, 1995–2003 and 2008–2026; same time today.