No overlap — one side will join outside working hours
CST (Chicago)
SYDNEY (Sydney)
00:00
15:00Working
01:00
16:00Working
02:00
17:00
03:00
18:00
04:00
19:00
05:00
20:00
06:00
21:00
07:00
22:00
08:00
23:00
09:00Working
00:00+1doff
10:00Working
01:00+1doff
11:00Working
02:00+1doff
12:00Working
03:00+1doff
13:00Working
04:00+1doff
14:00Working
05:00+1doff
15:00Working
06:00+1doff
16:00Working
07:00+1doff
17:00
08:00+1d
18:00
09:00+1dWorking
19:00
10:00+1dWorking
20:00
11:00+1dWorking
21:00
12:00+1dWorking
22:00
13:00+1dWorking
23:00
14:00+1dWorking
Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between cst and sydney?
Central Standard Time (cst) is UTC-5 and SYDNEY (Sydney) (sydney) is UTC+10. The difference between them is 15 hours.
Where is cst used?
Central Standard Time (cst) is used in USA and surrounding regions. The IANA timezone identifier is America/Chicago. Note: cst is ambiguous and may refer to other timezones.
Where is sydney used?
SYDNEY (Sydney) (sydney) is used in Australia and surrounding regions. The IANA timezone identifier is Australia/Sydney.
How do I convert cst to sydney?
Use the interactive converter above. Drag the time slider to any cst time and the sydney equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
CST (Chicago) is 15 hours behind Sydney. When CST (Chicago) clocks hit noon, Sydney reads 03:00.
CST (Chicago) runs on America/Chicago; Sydney runs on Australia/Sydney. Together they are 15 hours apart.
Working hours overlap
There is no business hours overlap between CST (Chicago) and Sydney during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.
Best times to schedule a meeting
CST (Chicago) and Sydney have no shared working window. These slots minimize out-of-hours disruption for both sides.
16:00 Chicago / 07:00 Sydney⚡ One side off-hours
⚠️ 2h before working hours in Sydney
18:00 Chicago / 09:00 Sydney⚡ One side off-hours
⚠️ 2h after working hours in Chicago
15:00 Chicago / 06:00 Sydney⚡ One side off-hours
⚠️ 3h before working hours in Sydney
Working hours defined as 09:00–17:00 local time for each location.
Holiday calendar for both locations
⚡ Both locations have upcoming holidays, check availability before scheduling.
CST (Chicago)7 holidays
Jul 3Independence DaySOON
Sep 7Labour Day
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
Nov 11Veterans Day
Sydney7 holidays
Aug 3Picnic Day
Sep 28King's Birthday
Oct 5Labour Day
Oct 5King's Birthday
Nov 3Melbourne Cup
Working across CST (Chicago) and Sydney
Working across CST (Chicago) (USA) and Sydney (Australia) is a challenge — the 15-hour difference means no shared business hours window under a standard schedule. Flexibility from at least one side is required.
💡 Best practice for cross-timezone meetings
⚡
A 16:00 meeting in CST (Chicago) means 07:00 in Sydney (2h before working hours in Sydney).
⚡
A 18:00 meeting in CST (Chicago) means 09:00 in Sydney (2h after working hours in Chicago).
⚡
A 15:00 meeting in CST (Chicago) means 06:00 in Sydney (3h before working hours in Sydney).
Since there is no natural overlap, the options above represent the most balanced compromise, minimizing out-of-hours inconvenience for both sides.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am CST (Chicago)".