Sydney to CST
-16hSydney
AESTSOURCECST
CSTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and CST on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and CST (Central Standard Time) timezone regions across the globe.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
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.
About Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
Time Conversion Guide: Sydney to CST
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. CST runs on Central Standard Time (CST) at UTC-06:00. That puts Sydney 16 hours behind CST — a difference of -16h at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 5:00 PM in CST on the previous day. Midnight in Sydney is 8:00 AM in CST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sydney to CST time conversion table
| Sydney (AEST) | CST (CST) | Day |
|---|---|---|
| 12:00 AM | 8:00 AM | previous day |
| 6:00 AM | 2:00 PM | previous day |
| 7:00 AM | 3:00 PM | previous day |
| 8:00 AM | 4:00 PM | previous day |
| 9:00 AM | 5:00 PM | previous day |
| 12:00 PM | 8:00 PM | previous day |
| 3:00 PM | 11:00 PM | previous day |
| 5:00 PM | 1:00 AM | same day |
| 6:00 PM | 2:00 AM | same day |
| 9:00 PM | 5:00 AM | same day |
Why people convert Sydney to CST time
- Scheduling a call from Sydney to CST: a 10:00 AM start in Sydney lands at 6:00 PM in CST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -16h gap: Sydney and CST 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 CST is 5:00 PM in Sydney.
- Booking travel or deliveries: tracking CST local time against Sydney keeps pickup windows and arrival estimates honest across the -16h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -16h gap is not.
- With a -16h gap there is no shared 9-to-5 window, so alternate the early start: one week Sydney takes the early slot, the next week CST does.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Re-check this page after that date because the offset changes and so does the -16h gap.
About AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
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 Sydney and CST
With a -16h offset there is no overlap inside a normal 9 AM – 5 PM day. CST opens at 9:00 AM CST, which is 5:00 PM in Sydney, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Sydney and CST have no shared working hours because of the -16h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Sydney is 16 hours behind CST (AEST UTC+10:00 → 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
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
CST
☀ Currently in DST
Standard: UTC-06:00 · DST: UTC-05:00
Clocks fall back on Sun, Nov 1, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
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 Sydney and CST?
Sydney (AEST, UTC+10:00) is 16 hours behind CST (CST, UTC-06:00). The gap is currently -16h.
How do I convert Sydney time to CST time?
Add -16h to Sydney local time. For example, 9:00 AM in Sydney is 5:00 PM in CST (previous day).
What time is it in CST right now?
CST 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 -16h offset from Sydney.
What is the best time to call CST from Sydney?
There is no shared working-hours window because of the -16h gap. The closest option is 1:00 PM in Sydney, which is 9:00 PM in CST.
Which is behind, Sydney or CST?
Sydney is 16 hours behind CST. When it is 12:00 PM in Sydney it is 8:00 PM in CST.
Do Sydney and CST use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while CST uses CST at UTC-06:00. The IANA identifiers are Australia/Sydney and America/Chicago.
Does daylight saving time affect the Sydney–CST difference?
Neither zone observes daylight saving time, so the -16h offset between Sydney and CST is fixed all year.
Which other cities share Sydney's time zone?
AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
Which countries use AEST, Sydney's zone?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Is there a day difference between Sydney and CST?
Sometimes. The -16h gap is large enough that 8:00 PM or later in Sydney already falls on the in CST.
What is the time difference between Sydney and CST?
CST is -16h from Sydney.
What timezone is Sydney in?
Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
What timezone is CST in?
CST operates on its local timezone.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
Which countries use AEST (Australian Eastern Standard Time)?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Does AEST observe daylight saving time?
Yes, AEST switches to AEDT during summer months.
What are some interesting facts about AEST?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
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 Sydney, what time is it in CST?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -16h later in CST (CST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Sydney time conversions
- sydney to melbourne
- sydney to perth
- sydney to aest
- sydney to aedt
- sydney to new york
- sydney to london
- sydney to dubai
- sydney to tokyo
- sydney to singapore
- sydney to los angeles
- sydney to paris
- sydney to delhi
- sydney to mumbai
- sydney to berlin
- sydney to hong kong
- sydney to toronto
- sydney to kathmandu
- new york to sydney
- london to sydney
- dubai to sydney
- tokyo to sydney
- singapore to sydney
- los angeles to sydney
- paris to sydney
- delhi to sydney
- mumbai to sydney
- berlin to sydney
- hong kong to sydney
- toronto to sydney
- kathmandu to sydney
See every conversion from Sydney →·See every conversion from CST →