Time difference between Chicago and Sydney

Does the gap change?

The gap isn't fixed. Chicago and Sydney both use daylight saving time, but they change their clocks on different dates and in opposite seasons, so the difference moves during the year:

• From around November 1, 2026: Sydney ahead by 17 hours
• From around March 14, 2027: Sydney ahead by 16 hours
• From around April 3, 2027: Sydney ahead by 15 hours
• From around October 2, 2027: Sydney ahead by 16 hours

Best time to meet

Normal office hours in Sydney and Chicago don't overlap. The most workable window is 3 PM to 10 PM in Chicago, which is 7 AM to 2 PM in Sydney, with one side starting early or finishing late.

For a recurring meeting, it's fairest to rotate which city takes the inconvenient slot.

City details

• Time zone and daylight saving in Chicago
• Time zone and daylight saving in Sydney

Chicago to Sydney, hour by hour

Chicago		Sydney
12 AM	Night	4 PM	Work hours
1 AM	Night	5 PM	Early or late
2 AM	Night	6 PM	Early or late
3 AM	Night	7 PM	Early or late
4 AM	Night	8 PM	Early or late
5 AM	Night	9 PM	Early or late
6 AM	Night	10 PM	Night
7 AM	Early or late	11 PM	Night
8 AM	Early or late	12 AM (Mon)	Night
9 AM	Work hours	1 AM (Mon)	Night
10 AM	Work hours	2 AM (Mon)	Night
11 AM	Work hours	3 AM (Mon)	Night
12 PM	Work hours	4 AM (Mon)	Night
1 PM	Work hours	5 AM (Mon)	Night
2 PM	Work hours	6 AM (Mon)	Night
3 PM	Work hours	7 AM (Mon)	Early or late
4 PM	Work hours	8 AM (Mon)	Early or late
5 PM	Early or late	9 AM (Mon)	Work hours
6 PM	Early or late	10 AM (Mon)	Work hours
7 PM	Early or late	11 AM (Mon)	Work hours
8 PM	Early or late	12 PM (Mon)	Work hours
9 PM	Early or late	1 PM (Mon)	Work hours
10 PM	Night	2 PM (Mon)	Work hours
11 PM	Night	3 PM (Mon)	Work hours

Based on today's clocks. Work hours are 9 AM to 5 PM.