Convert ACST to EDT
EDT is 13 hours 30 minutes behind ACST. ACST is UTC+9:30 and EDT is UTC−4.
Right now: ACST · EDT
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between ACST and EDT. Someone has to take an early or late call — or use asynchronous communication instead.
| ACST | EDT | Suitable? |
|---|---|---|
| 9:00 AM | 7:30 PM (previous day) | outside 9–5 |
| 10:00 AM | 8:30 PM (previous day) | outside 9–5 |
| 11:00 AM | 9:30 PM (previous day) | outside 9–5 |
| 12:00 PM | 10:30 PM (previous day) | outside 9–5 |
| 1:00 PM | 11:30 PM (previous day) | outside 9–5 |
| 2:00 PM | 12:30 AM | outside 9–5 |
| 3:00 PM | 1:30 AM | outside 9–5 |
| 4:00 PM | 2:30 AM | outside 9–5 |
| 5:00 PM | 3:30 AM | outside 9–5 |
ACST to EDT conversion table
| ACST | EDT |
|---|---|
| 12:00 AM | 10:30 AM (previous day) |
| 1:00 AM | 11:30 AM (previous day) |
| 2:00 AM | 12:30 PM (previous day) |
| 3:00 AM | 1:30 PM (previous day) |
| 4:00 AM | 2:30 PM (previous day) |
| 5:00 AM | 3:30 PM (previous day) |
| 6:00 AM | 4:30 PM (previous day) |
| 7:00 AM | 5:30 PM (previous day) |
| 8:00 AM | 6:30 PM (previous day) |
| 9:00 AM | 7:30 PM (previous day) |
| 10:00 AM | 8:30 PM (previous day) |
| 11:00 AM | 9:30 PM (previous day) |
| 12:00 PM | 10:30 PM (previous day) |
| 1:00 PM | 11:30 PM (previous day) |
| 2:00 PM | 12:30 AM |
| 3:00 PM | 1:30 AM |
| 4:00 PM | 2:30 AM |
| 5:00 PM | 3:30 AM |
| 6:00 PM | 4:30 AM |
| 7:00 PM | 5:30 AM |
| 8:00 PM | 6:30 AM |
| 9:00 PM | 7:30 AM |
| 10:00 PM | 8:30 AM |
| 11:00 PM | 9:30 AM |
About ACST
Australian Central Standard Time (ACST) is UTC+9:30. It is used in Adelaide and Darwin in winter.
Australian Central Standard Time is UTC+9:30, half an hour behind the eastern states rather than a whole hour, which surprises people every time. South Australia moves to daylight saving in October and the Northern Territory does not, so Adelaide and Darwin share this offset for half the year and are an hour apart for the other half.
About EDT
Eastern Daylight Time (EDT) is UTC−4. It is used in New York, Toronto, Miami and Atlanta from March to November.
Eastern Daylight Time is UTC−4, the summer clock for New York, Toronto, Miami and Atlanta, running from the second Sunday in March to the first Sunday in November. Those dates are US law and do not match Europe's, which changes on the last Sundays of March and October — so for two weeks in March and one in late October the gap between New York and London is an hour different from its usual five.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on EDT switches to EST (UTC−5) from November to March. So the 13.5-hour figure on this page is correct for the part of the year when both places are actually on these abbreviations, and changes by an hour outside it.
ACST does not shift, so the whole change comes from one side. A recurring meeting fixed in ACST will appear to move by an hour for everyone on the other side, twice a year, without anyone changing anything.
This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.
Frequently asked questions
What time is 9:00 AM ACST in EDT?
9:00 AM ACST is 7:30 PM EDT (previous day).
Is EDT ahead of ACST?
EDT is 13 hours 30 minutes behind ACST.
Which time zone does this use?
ACST is UTC+9:30 and EDT is UTC−4. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.