Sydney is 14, 15 or 16 hours ahead of New York, depending on the time of year.
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Quick reference
| SYDNEY | NEW YORK · EARLY NOV–MID-MAR | NEW YORK · EARLY APR–EARLY OCT | NEW YORK · IN BETWEEN |
|---|---|---|---|
| 9:00 am | 5:00 pm previous day | 7:00 pm previous day | 6:00 pm previous day |
| 12:00 pm | 8:00 pm previous day | 10:00 pm previous day | 9:00 pm previous day |
| 3:00 pm | 11:00 pm previous day | 1:00 am | 12:00 am |
| 6:00 pm | 2:00 am | 4:00 am | 3:00 am |
| 9:00 pm | 5:00 am | 7:00 am | 6:00 am |
Questions
16 hours from early November to mid-March, 14 hours from early April to early October, and 15 hours in between (mid-March to early April, and early October to early November).
5pm the previous day from early November to mid-March, 7pm the previous day from early April to early October, and 6pm the previous day in between (mid-March to early April, and early October to early November).
Yes, both, on different dates. Sydney moves to AEDT (UTC+11) in early October and back to AEST (UTC+10) in early April; New York moves to EDT (UTC-4) in mid-March and back to EST (UTC-5) in early November.