ACST to Mexico
-15h 30mACST
ACSTSOURCEMexico
CSTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and CST on the World Map
The map below highlights the ACST (Australian Central Standard Time) and CST (Central Standard Time) timezone regions across the globe.
ACST – Australian Central Standard Time
UTC+09:30Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.
- •ACST uses a half-hour offset: UTC+09:30.
- •South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
- •Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
- •Adelaide is one of the few major cities on a 30-minute offset.
CST – Central Standard Time
UTC-06:00Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.
- •CST covers 20 US states fully or partially.
- •Chicago and Houston are the two largest cities in the Central Time Zone.
- •Mexico City, one of the world's most populous cities, operates on CST.
- •CST is 1 hour behind EST and 2 hours ahead of PST.
Understanding the -15h 30m Gap: ACST vs Mexico
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. Mexico runs on Central Standard Time (CST) at UTC-06:00. That puts ACST 15 hours 30 minutes behind Mexico — a difference of -15h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 5:30 PM in Mexico on the previous day. Midnight in ACST is 8:30 AM in Mexico. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to Mexico time conversion table
| ACST (ACST) | Mexico (CST) | Day |
|---|---|---|
| 12:00 AM | 8:30 AM | previous day |
| 6:00 AM | 2:30 PM | previous day |
| 7:00 AM | 3:30 PM | previous day |
| 8:00 AM | 4:30 PM | previous day |
| 9:00 AM | 5:30 PM | previous day |
| 12:00 PM | 8:30 PM | previous day |
| 3:00 PM | 11:30 PM | previous day |
| 5:00 PM | 1:30 AM | same day |
| 6:00 PM | 2:30 AM | same day |
| 9:00 PM | 5:30 AM | same day |
Why people convert ACST to Mexico time
- Scheduling a call from ACST to Mexico: a 10:00 AM start in ACST lands at 6:30 PM in Mexico the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -15h 30m gap: ACST and Mexico have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Mexico is 5:30 PM in ACST.
- Coordinating a ACST-based team with Mexico contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -15h 30m gap is not.
- With a -15h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week ACST takes the early slot, the next week Mexico does.
About ACST (Australian Central Standard Time)
Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.
About CST (Central Standard Time)
Central Standard Time (CST) covers the central region of North America. It is the second most populous time zone in the US, including major cities like Chicago, Houston, and Dallas. CST is also used in Mexico City and much of Central America including Guatemala, Honduras, El Salvador, and Costa Rica. During summer, most of the US and Canada switch to Central Daylight Time (CDT, UTC-05:00), while Mexico and Central American countries generally remain on CST.
Best time to call between ACST and Mexico
With a -15h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Mexico opens at 9:00 AM CST, which is 5:30 PM in ACST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
ACST and Mexico have no shared working hours because of the -15h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
ACST is 15 hours 30 minutes behind Mexico (ACST UTC+09:30 → CST UTC-06:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
Mexico
Does not observe DST
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between ACST and Mexico?
ACST (ACST, UTC+09:30) is 15 hours 30 minutes behind Mexico (CST, UTC-06:00). The gap is currently -15h 30m.
How do I convert ACST time to Mexico time?
Add -15h 30m to ACST local time. For example, 9:00 AM in ACST is 5:30 PM in Mexico (previous day).
What time is it in Mexico right now?
Mexico uses CST at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -15h 30m offset from ACST.
What is the best time to call Mexico from ACST?
There is no shared working-hours window because of the -15h 30m gap. The closest option is 1:00 PM in ACST, which is 9:30 PM in Mexico.
Which is behind, ACST or Mexico?
ACST is 15 hours 30 minutes behind Mexico. When it is 12:00 PM in ACST it is 8:30 PM in Mexico.
Do ACST and Mexico use different time zones?
ACST uses ACST at UTC+09:30, while Mexico (Mexico) uses CST at UTC-06:00. The IANA identifiers are Australia/Adelaide and America/Mexico_City.
Does daylight saving time affect the ACST–Mexico difference?
Neither zone observes daylight saving time, so the -15h 30m offset between ACST and Mexico is fixed all year.
Which other cities share ACST's time zone?
ACST also covers Adelaide, Darwin, Alice Springs, Mount Gambier.
Which countries use ACST, ACST's zone?
ACST is used in Australia (South Australia, Northern Territory).
Is there a day difference between ACST and Mexico?
Sometimes. The -15h 30m gap is large enough that 8:00 PM or later in ACST already falls on the in Mexico.
What is the time difference between ACST and Mexico?
Mexico is -15h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is Mexico in?
Mexico operates on its local timezone.
Which countries use ACST (Australian Central Standard Time)?
ACST is used in Australia (South Australia, Northern Territory).
Does ACST observe daylight saving time?
Yes, ACST switches to ACDT during summer months.
What are some interesting facts about ACST?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
Which cities are in the CST timezone?
Major cities in the CST timezone include Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis.
What is the UTC offset for CST?
Central Standard Time (CST) is at UTC-06:00. During daylight saving time, it shifts to CDT.
What should I know about the CST timezone?
CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.
When is it midnight in ACST, what time is it in Mexico?
When it is 12:00 AM (midnight) in ACST (ACST), it is -15h 30m later in Mexico (CST).
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See every conversion from ACST →·See every conversion from Mexico →