Convert GST to ACDT
ACDT is 6 hours 30 minutes ahead of GST. GST is UTC+4 and ACDT is UTC+10:30.
Right now: GST · ACDT
Best time to schedule a meeting
Standard 9–5 working hours overlap for 2 hours: 9:00 AM–11:00 AM GST (3:00 PM–5:00 PM ACDT). Schedule meetings inside that window.
| GST | ACDT | Suitable? |
|---|---|---|
| 9:00 AM | 3:30 PM | working hours |
| 10:00 AM | 4:30 PM | working hours |
| 11:00 AM | 5:30 PM | outside 9–5 |
| 12:00 PM | 6:30 PM | outside 9–5 |
| 1:00 PM | 7:30 PM | outside 9–5 |
| 2:00 PM | 8:30 PM | outside 9–5 |
| 3:00 PM | 9:30 PM | outside 9–5 |
| 4:00 PM | 10:30 PM | outside 9–5 |
| 5:00 PM | 11:30 PM | outside 9–5 |
GST to ACDT conversion table
| GST | ACDT |
|---|---|
| 12:00 AM | 6:30 AM |
| 1:00 AM | 7:30 AM |
| 2:00 AM | 8:30 AM |
| 3:00 AM | 9:30 AM |
| 4:00 AM | 10:30 AM |
| 5:00 AM | 11:30 AM |
| 6:00 AM | 12:30 PM |
| 7:00 AM | 1:30 PM |
| 8:00 AM | 2:30 PM |
| 9:00 AM | 3:30 PM |
| 10:00 AM | 4:30 PM |
| 11:00 AM | 5:30 PM |
| 12:00 PM | 6:30 PM |
| 1:00 PM | 7:30 PM |
| 2:00 PM | 8:30 PM |
| 3:00 PM | 9:30 PM |
| 4:00 PM | 10:30 PM |
| 5:00 PM | 11:30 PM |
| 6:00 PM | 12:30 AM (next day) |
| 7:00 PM | 1:30 AM (next day) |
| 8:00 PM | 2:30 AM (next day) |
| 9:00 PM | 3:30 AM (next day) |
| 10:00 PM | 4:30 AM (next day) |
| 11:00 PM | 5:30 AM (next day) |
About GST
Gulf Standard Time (GST) is UTC+4. It is used in Dubai, Abu Dhabi and Muscat.
Gulf Standard Time is UTC+4, covering the United Arab Emirates and Oman, and there is no daylight saving anywhere on the Arabian peninsula. The scheduling complication in the region is not the clock but the week: the UAE moved its weekend to Saturday–Sunday in 2022, while Saudi Arabia and several neighbours keep Friday–Saturday, so a Thursday afternoon meeting lands differently across a border that has no time difference at all.
About ACDT
Australian Central Daylight Time (ACDT) is UTC+10:30. It is used in Adelaide in summer.
Australian Central Daylight Time is UTC+10:30, what South Australia keeps from October to April. Darwin stays on ACST through the summer, so for those months two cities in the same nominal zone are an hour apart — the only reason to be precise about which of the two abbreviations a meeting invitation carries.
Does this gap change with the seasons?
Neither GST nor ACDT shifts with the seasons, so this 6.5-hour difference holds all year. That is unusual enough to be worth relying on: most cross-continental gaps move twice a year.
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 GST in ACDT?
9:00 AM GST is 3:30 PM ACDT.
Is ACDT ahead of GST?
ACDT is 6 hours 30 minutes ahead of GST.
Which time zone does this use?
GST is UTC+4 and ACDT is UTC+10:30. 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.