No overlap — one side will join outside working hours
CDT (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 cdt and sydney?
Central Daylight Time (cdt) is UTC-5 and SYDNEY (Sydney) (sydney) is UTC+10. The difference between them is 15 hours.
Where is cdt used?
Central Daylight Time (cdt) is used in USA and surrounding regions. The IANA timezone identifier is America/Chicago.
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 cdt to sydney?
Use the interactive converter above. Drag the time slider to any cdt time and the sydney equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
CDT (Chicago) is 15 hours behind Sydney. When it's noon in CDT (Chicago), it's 03:00 in Sydney.
CDT (Chicago) is in the America/Chicago timezone. Sydney is in Australia/Sydney. The difference is 15 hours.
Mutual working hours
CDT (Chicago) and Sydney have no shared working hours under a standard 9:00–17:00 schedule. One side will always need to join at an off-hour.
Recommended meeting windows
Since CDT (Chicago) and Sydney don't share working hours, these are the most practical options available.
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
Based on standard 09:00–17:00 working hours in each location's local time.
Public holidays this year
⚡ Upcoming holidays in both locations, confirm with your contact before booking.
CDT (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
CDT (Chicago) and Sydney — practical scheduling
CDT (Chicago) (USA) and Sydney (Australia) are 15 hours apart — far enough that standard 9–5 schedules do not overlap. Any real-time meeting means someone is joining outside their normal hours.
💡 Practical scheduling guidelines
⚡
When CDT (Chicago) is at 16:00, Sydney reads 07:00 — 2h before working hours in Sydney.
⚡
When CDT (Chicago) is at 18:00, Sydney reads 09:00 — 2h after working hours in Chicago.
⚡
When CDT (Chicago) is at 15:00, Sydney reads 06:00 — 3h before working hours in Sydney.
With no shared business hours, these slots distribute the scheduling burden as evenly as possible between both locations.
DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.
Use the time slider above to find the exact equivalent time for any moment in CDT (Chicago). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.
