Old Greenwich to Chicago Time Converter

Updating current time…
Old Greenwich
Connecticut, USAEDT
UTC−4
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Old Greenwich's clocks go back 1 hour on Sun, Nov 1 · EDT → EST
Chicago
Illinois, USACDT
UTC−5
1h behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Chicago's clocks go back 1 hour on Sun, Nov 1 · CDT → CST

Quick answers

Selected conversion

8:00 am08:00 EDT (UTC-4), Oct 30, 2026 = 7:00 am07:00 CDT (UTC-5), Oct 30, 2026

Old Greenwich is 1 hour ahead of Chicago.

How the time difference changes

Normally, Old Greenwich is 1 hour ahead of Chicago. Briefly around seasonal clock changes, Old Greenwich is 2 hours ahead of Chicago or Old Greenwich and Chicago have the same time.

Typically, working hours of 9:00 am to 6:00 pm in Old Greenwich correspond to 8:00 am to 5:00 pm in Chicago.Typically, working hours of 09:00 to 18:00 in Old Greenwich correspond to 08:00 to 17:00 in Chicago.

Compare Old Greenwich time with Chicago time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

EDT (Eastern Daylight Time) is 1 hour ahead of CDT (Central Daylight Time).
8:00 am08:00 in Old Greenwich, CT, USA is 7:00 am07:00 in Chicago, IL, USA

Old Greenwich to Chicago call time
Best time for a conference call or a meeting is between 10am-6pm10:00-18:00 in Old Greenwich which corresponds to 9am-5pm09:00-17:00 in Chicago

8:00 am08:00 EDT (Eastern Daylight Time) (Old Greenwich, CT, USA). Offset UTC -4:00 hours
7:00 am07:00 CDT (Central Daylight Time) (Chicago, IL, USA). Offset UTC -5:00 hours

8:00 am08:00 Old Greenwich, CT, USA / 7:00 am07:00 Chicago, IL, USA

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
Old Greenwich, CT, USAChicago, IL, USA
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Old Greenwich Time Zone and Facts

Time Zone

Abbreviation / Offset
EDT – Eastern Daylight Time, UTC-4 (now, daylight saving time)
EST – Eastern Standard Time, UTC-5 (standard time)
Daylight Saving Time Ends
123456789101112Sunday, November 1, 2026 at 2:00 amSunday, November 1, 2026 at 02:00: clocks go back 1 hour to 1:00 am01:00 (EST). DST ends on the 1st Sunday of November each year. Also called Fall Back or Winter Time.
Daylight Saving Time Starts
123456789101112Sunday, March 14, 2027 at 2:00 amSunday, March 14, 2027 at 02:00: clocks go forward 1 hour to 3:00 am03:00 (EDT). DST starts on the 2nd Sunday of March each year. Also called Spring Forward or Summer Time.
Clock Changes
USA daylight saving time · Clock changes worldwide

Old Greenwich Facts

Country
USA
State
Connecticut
Population
6,611
Currency
Dollar (USD)
Geographic Coordinates
41° 01' N Latitude / 73° 33' W Longitude
International Dialing Code
+1
More About Old Greenwich
Old Greenwich local time and city facts

Chicago Time Zone and Facts

Time Zone

Abbreviation / Offset
CDT – Central Daylight Time, UTC-5 (now, daylight saving time)
CST – Central Standard Time, UTC-6 (standard time)
Daylight Saving Time Ends
123456789101112Sunday, November 1, 2026 at 2:00 amSunday, November 1, 2026 at 02:00: clocks go back 1 hour to 1:00 am01:00 (CST). DST ends on the 1st Sunday of November each year. Also called Fall Back or Winter Time.
Daylight Saving Time Starts
123456789101112Sunday, March 14, 2027 at 2:00 amSunday, March 14, 2027 at 02:00: clocks go forward 1 hour to 3:00 am03:00 (CDT). DST starts on the 2nd Sunday of March each year. Also called Spring Forward or Summer Time.
Clock Changes
USA daylight saving time · Clock changes worldwide

Chicago Facts

Country
USA
State
Illinois
Alternative Names
CHI, Cekaga, Chi-ka-ko, Chi-kâ-kô, Chicago, Chicagu, Chikago, Chykaga, Cikaga, Cikago, Cikaqo, E-Chicago, Kikako, Shikago, Sicagum, Sikago, The Windy City, Tsikago, Windy City, chikhako, cikago, cikako, shikago, shkagw, shykaghw, shykagw, shykajw, shyqgw, sikago, sikkagea, syqgw, zhi jia ge, Çikago, Çikaqo, Ĉikago, Čikaga, Čikago, Čikāga, Čėkaga, Şikago, Σικάγο, Чикаго, Чикаґо, Чыкага, Չիկագո, שיקאגא, שיקגו, شيكاجو, شيكاغو, شکاگو, شیکاگو, شیکاگۆ, ܫܝܩܓܘ, शिकागो, শিকাগো, ਸ਼ਿਕਾਗੋ, சிகாகோ, చికాగో, ಶಿಕಾಗೊ, ഷിക്കാഗോ, ชิคาโก, ရှီကာဂိုမြို့, ჩიკაგო, ሺካጎ, ᓰᖄᑯ, Ṣìkágò, シカゴ, 芝加哥, 시카고, 𐍃𐌾𐌹𐌺𐌰𐌲𐍉
Population
2,664,452
Currency
Dollar (USD)
Geographic Coordinates
41° 51' N Latitude / 87° 39' W Longitude
International Dialing Code
+1
More About Chicago
Chicago time now