| Year : 1901 - Mangilao Village Guam |
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| Back to standard time on thuesday 01 january 1901 00 h 21 (GMT + 10 h ) GST |
| Year : 1941 - Mangilao Village Guam |
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| Back to standard time on thuesday 09 december 1941 23 h 00 (GMT + 9 h ) +09 |
| Year : 1944 - Mangilao Village Guam |
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| Back to standard time on monday 31 july 1944 01 h 00 (GMT + 10 h ) GST |
| Year : 1959 - Mangilao Village Guam |
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| Transition to daylight saving time on saturday 27 june 1959 03 h 00 (GMT + 11 h ) GDT |
| Year : 1961 - Mangilao Village Guam |
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| Back to standard time on sunday 29 january 1961 01 h 00 (GMT + 10 h ) GST |
| Year : 1967 - Mangilao Village Guam |
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| Transition to daylight saving time on friday 01 september 1967 03 h 00 (GMT + 11 h ) GDT |
| Year : 1969 - Mangilao Village Guam |
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| Back to standard time on saturday 25 january 1969 23 h 01 (GMT + 10 h ) GST |
| Transition to daylight saving time on sunday 22 june 1969 03 h 00 (GMT + 11 h ) GDT |
| Back to standard time on sunday 31 august 1969 01 h 00 (GMT + 10 h ) GST |
| Year : 1970 - Mangilao Village Guam |
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| Transition to daylight saving time on sunday 26 april 1970 03 h 00 (GMT + 11 h ) GDT |
| Back to standard time on sunday 06 september 1970 01 h 00 (GMT + 10 h ) GST |
| Year : 1971 - Mangilao Village Guam |
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| Transition to daylight saving time on sunday 25 april 1971 03 h 00 (GMT + 11 h ) GDT |
| Back to standard time on sunday 05 september 1971 01 h 00 (GMT + 10 h ) GST |
| Year : 1973 - Mangilao Village Guam |
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| Transition to daylight saving time on sunday 16 december 1973 03 h 00 (GMT + 11 h ) GDT |
| Year : 1974 - Mangilao Village Guam |
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| Back to standard time on sunday 24 february 1974 01 h 00 (GMT + 10 h ) GST |
| Year : 1976 - Mangilao Village Guam |
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| Transition to daylight saving time on wednesday 26 may 1976 03 h 00 (GMT + 11 h ) GDT |
| Back to standard time on sunday 22 august 1976 01 h 01 (GMT + 10 h ) GST |
| Year : 1977 - Mangilao Village Guam |
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| Transition to daylight saving time on sunday 24 april 1977 03 h 00 (GMT + 11 h ) GDT |
| Back to standard time on sunday 28 august 1977 01 h 00 (GMT + 10 h ) GST |
| Year : 2000 - Mangilao Village Guam |
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| Back to standard time on saturday 23 december 2000 00 h 00 (GMT + 10 h ) ChST |
