Half-hour and 45-minute time zones
14 of the 312 zones keep a standard time that is not a whole number of hours from UTC: 11 sit on the half hour and 3 on a 45-minute mark. Since 1970 another 12 zones used such an offset for a while and then moved to a whole hour.
Zones on a fractional offset today
| Zone | Standard time | Clock changes today | Standard time unchanged since |
|---|---|---|---|
| Chatham Islands, New Zealand | UTC+12:45 | yes | 1946 |
| Lord Howe Island, Australia | UTC+10:30 | yes | 1981 |
| Adelaide, Australia | UTC+9:30 | yes | 1899 |
| Broken Hill, Australia | UTC+9:30 | yes | 1899 |
| Darwin, Australia | UTC+9:30 | no | 1899 |
| Eucla, Australia | UTC+8:45 | no | 1895 |
| Myanmar | UTC+6:30 | no | 1945 |
| Nepal | UTC+5:45 | no | 1986 |
| Sri Lanka | UTC+5:30 | no | 2006 |
| India | UTC+5:30 | no | 1906 |
| Afghanistan | UTC+4:30 | no | 1945 |
| Iran | UTC+3:30 | no | 1978 |
| St. John’s, Canada | UTC−3:30 | yes | 1935 |
| Marquesas Islands, French Polynesia | UTC−9:30 | no | 1912 |
Zones that left a fractional offset after 1970
| Zone | Fractional standard time used | Standard time today |
|---|---|---|
| Venezuela | UTC−4:30 (2007 to 2016) | UTC−4 |
| Guyana | UTC−3:45 (1970 to 1975) | UTC−4 |
| Kiritimati, Kiribati | UTC−10:40 (1970 to 1979) | UTC+14 |
| Liberia | UTC−0:44:30 (1970 to 1972) | UTC+0 |
| Nauru | UTC+11:30 (1970 to 1979) | UTC+12 |
| Norfolk Island | UTC+11:30 (1970 to 2015) | UTC+11 |
| Suriname | UTC−3:30 (1970 to 1984) | UTC−3 |
| Pitcairn Islands | UTC−8:30 (1970 to 1998) | UTC−8 |
| North Korea | UTC+8:30 (2015 to 2018) | UTC+9 |
| Cook Islands | UTC−10:30 (1970 to 1978) | UTC−10 |
| Singapore | UTC+7:30 (1970 to 1981) | UTC+8 |
| Bhutan | UTC+5:30 (1970 to 1987) | UTC+6 |
More context: half-hour and 45-minute time zones explained.