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Illinois • Live Time-Zone Reference

Illinois Time Zone

Illinois is entirely in Central Time (CT). The state uses CST during standard time and CDT during daylight saving time. Chicago, Springfield, Rockford, Peoria, Champaign, Aurora and every one of Illinois’ 102 counties follow the same official time-zone rules.

Quick answer: Illinois has one time zone. Standard time is CST (UTC−06:00); daylight time is CDT (UTC−05:00). Illinois observes daylight saving time, and there is no in-state time-zone boundary to account for when traveling between Illinois cities.
Official time zoneCentral TimeStatewide
Standard timeCST · UTC−06Central Standard Time
Daylight timeCDT · UTC−05When DST is active
Illinois Time Zone at a Glance Illinois Time Zone Map Current Time in Illinois
Search an Illinois city, related state, time-zone name, abbreviation or UTC offset.
Popular: U.S. Time Zones Central Time CST CDT Daylight Saving Time Chicago Time Zone Illinois Time Zone Map

Illinois Time Zone at a Glance

Everything needed to identify Illinois time correctly: statewide Central Time, the current abbreviation and offset, DST rules, map context and the live current-time page.

CT

Central Time in Illinois

Illinois follows Central Time statewide, with no second official time zone inside the state.

Central Time details → CST

Illinois Standard Time

During standard time, Illinois uses CST at UTC−06:00.

See CST now → CDT

Illinois Daylight Time

During daylight saving time, Illinois uses CDT at UTC−05:00.

See CDT now → DST

Illinois Daylight Saving Time

Illinois changes clocks in March and November under the current U.S. DST schedule.

See DST rules → ⌖

Illinois Time Zone Map

See Illinois inside Central Time and the Eastern–Central boundary immediately east in Indiana.

View Illinois map → ◷

Current Time in Illinois

Open the statewide live-time page when your main question is what time it is in Illinois right now.

See Illinois time now →

Illinois Time Zone by Major City

Illinois is a straightforward statewide case: every major city below uses the same Central Time rules. The live abbreviation and UTC offset change automatically with the date.

Current time across Illinois →
Illinois LocationTime ZoneCurrent TimeCurrent AbbreviationCurrent UTC OffsetReference
ChicagoCentral TimeLive——Chicago Time Zone
SpringfieldCentral TimeLive——Central Time
RockfordCentral TimeLive——Central Time
PeoriaCentral TimeLive——Central Time
ChampaignCentral TimeLive——Central Time
AuroraCentral TimeLive——Central Time
Central Time ZoneCurrent Time in IllinoisU.S. Time Zone Map

Illinois Time-Zone Guides & Related References

Continue with Chicago, the Central Time family, the official sibling state references, the Indiana boundary and dedicated current-time and map pages.

All U.S. time zones →
Illinois city ownerChicagoCentral Time · CST/CDT · America/Chicago.→ Zone familyCentral TimeThe time zone used throughout Illinois.→ Standard timeCSTUTC−06:00 in Illinois during standard time.→ Daylight timeCDTUTC−05:00 in Illinois while DST is active.→ Official sibling stateIowaCentral Time reference west of Illinois.→ Official sibling stateLouisianaAnother U.S. Central Time state reference.→ Eastern borderIndianaSplit between Eastern and Central Time.→ Live statewide timeCurrent Time in IllinoisCurrent clock and date for the state.→ Live city timeCurrent Time in ChicagoLive Chicago clock when current time is the main task.→ Visual referenceIllinois Time Zone MapSee Illinois and nearby zone boundaries visually.→ Conversion toolTime Zone ConverterConvert Illinois time to another location.→ U.S. directoryU.S. Time ZonesAll state references and major U.S. zones.→
Illinois Live Reference

Illinois Central Time & UTC Now

Illinois stays in Central Time statewide. The abbreviation changes between CST and CDT, so the UTC offset moves between UTC−06:00 and UTC−05:00 while the IANA zone remains America/Chicago.

Central TimeCSTCDTUTC TimeUTC Offsets
Illinois · Central TimeLive timeAmerica/Chicago · current abbreviation and offset
Indianapolis · Eastern TimeLive timeMost of Indiana is one hour ahead of Illinois.
UTC ReferenceLive timeCoordinated Universal Time · UTC+00:00
Statewide Zone Count1 zoneAll 102 Illinois counties use Central Time.

Illinois UTC Offset & City Reference

Illinois does not have one fixed UTC offset for the entire year. It is UTC−06:00 during CST and UTC−05:00 during CDT, with the same rule applying statewide.

Explore UTC offsets →
Illinois AreaIANA ZoneCurrent TimeCurrent UTC OffsetSeasonal Rule
Chicago / Northeast IllinoisAmerica/ChicagoLive—CST UTC−06 → CDT UTC−05
Springfield / Central IllinoisAmerica/ChicagoLive—CST UTC−06 → CDT UTC−05
Rockford / Northern IllinoisAmerica/ChicagoLive—CST UTC−06 → CDT UTC−05
Peoria / Central IllinoisAmerica/ChicagoLive—CST UTC−06 → CDT UTC−05
Champaign / East-Central IllinoisAmerica/ChicagoLive—CST UTC−06 → CDT UTC−05
Aurora / Northeast IllinoisAmerica/ChicagoLive—CST UTC−06 → CDT UTC−05

Illinois Standard Time vs Daylight Time

Illinois observes daylight saving time. The state moves from CST to CDT in spring and returns to CST in fall, while remaining inside the Central Time zone.

Daylight Saving Time guide →
Illinois ZoneStandard TimeStandard OffsetDaylight TimeDaylight Offset
Central Time (statewide)CSTUTC−06:00CDTUTC−05:00
Illinois DST RulesWhen DST StartsWhen DST EndsDST by State

Compare Illinois Central Time

Compare the current moment in Illinois with Eastern, Mountain, Pacific, UTC or major world locations. For a specific date and clock time, open the full converter.

Live time
Current abbreviation and UTC offset
Live time
Current abbreviation and UTC offset
Open Full ConverterTime Zone Difference

How Illinois Time Works

Six facts answer nearly every Illinois time-zone question, including whether the whole state shares one clock and why the UTC offset changes during the year.

01 · Official Zone

Illinois Is Central Time

The entire state belongs to the Central Time zone. Illinois has no official Eastern or Mountain Time area.

02 · Statewide

All 102 Counties Share One Clock

There is no in-state time-zone boundary, so every Illinois county follows the same official civil-time rule.

03 · Standard Time

CST Is UTC−06:00

When daylight saving time is not active, Illinois uses Central Standard Time, six hours behind UTC.

04 · Daylight Time

CDT Is UTC−05:00

During daylight saving time, Illinois advances one hour to Central Daylight Time.

05 · DST

Illinois Changes Clocks

Under current U.S. rules, Illinois moves forward in March and back in November.

06 · IANA

Use America/Chicago

America/Chicago supplies the date-aware Central Time rules used for live Illinois clocks and UTC offsets.

Does All of Illinois Have the Same Time?

Yes. Illinois uses Central Time statewide. Illinois has 102 counties, and none lies in Eastern or Mountain Time. Chicago, Springfield, Rockford, Peoria, Champaign and Aurora therefore follow the same CST/CDT schedule.

102 countiesEvery Illinois county follows the same official Central Time rules.
No in-state zone lineYou do not change official time zones while traveling between Illinois cities or counties.
One seasonal scheduleWhen Illinois changes from CST to CDT or back, the whole state changes together.
See the Illinois Time Zone MapCentral Time Zone

What Happens at the Illinois–Indiana Time-Zone Boundary?

Illinois remains Central Time at the state line, but Indiana is split. The federal Eastern–Central boundary in 49 CFR §71.5 runs through Indiana county lines before reaching the western boundary of Indiana. That means a trip east from Illinois may stay in Central Time in parts of northwestern or southwestern Indiana, or may move one hour ahead into Eastern Time depending on the destination.

This is why “Illinois and Indiana are one hour apart” is not a reliable statewide rule. For travel near Chicago and northwest Indiana, or near the lower Wabash/Ohio River region, use the exact Indiana destination rather than the state name alone.

Indiana Time ZoneIllinois Time Zone MapTime Zone DifferenceTime Zone Converter
Visual Geography

Illinois Time Zone Map

Illinois itself is entirely Central Time, but the map is useful because the Eastern–Central boundary lies immediately to the east inside Indiana. The dedicated Illinois map keeps the visual boundary task separate from this statewide time-zone reference.

Illinois Time Zone MapCentral Time Zone MapIndiana Time Zone Map

Looking for the Current Time in Illinois?

This page explains Illinois time-zone rules, UTC offsets, abbreviations, DST and geographic boundaries. If your main question is what time it is right now, use the statewide or Chicago live-time page.

Statewide current timeCurrent Time in Illinois
Chicago current timeCurrent Time in Chicago
Chicago zone guideChicago Time Zone
Visual referenceIllinois Time Zone Map

Sources & Methodology

CalendarHours uses location-aware, date-aware time-zone logic rather than permanently hardcoding Illinois as UTC−6 or UTC−5. America/Chicago supplies the Central Time rules used throughout Illinois.

The IANA Time Zone Database is the primary rules source for civil offsets and transitions. The latest release verified for this page is tzdb 2026c, released July 8, 2026. U.S. daylight-saving dates are checked against NIST; the Eastern–Central boundary is checked against 49 CFR §71.5; and the statewide 102-county fact is checked against Illinois state government sources.

IANA — Time Zone DatabaseNIST — Daylight Saving Time RuleseCFR — 49 CFR §71.5 Eastern–Central BoundaryState of Illinois — 102 CountiesTime.gov — Official U.S. Time

Reviewed August 20, 2026. This URL is evergreen; live clocks, current abbreviations and UTC offsets update automatically from supported browser time-zone data.

Illinois Time Zone FAQ

What time zone is Illinois in?

Illinois is entirely in Central Time. The state uses CST (UTC−06:00) in standard time and CDT (UTC−05:00) during daylight saving time.

How many time zones are in Illinois?

Illinois has one official time zone: Central Time. There is no Eastern, Mountain or Pacific Time area inside the state.

Does all of Illinois have the same time?

Yes. All 102 Illinois counties share the same official Central Time rules.

What time zone is Chicago in?

Chicago is in Central Time. It uses CST during standard time and CDT during daylight saving time. See the Chicago Time Zone guide.

What time zone is Springfield, Illinois in?

Springfield is in Central Time and follows the same CST/CDT schedule as Chicago and the rest of Illinois.

Is Illinois on CST or CDT right now?

Illinois uses CST during standard time and CDT during daylight saving time. The live clock above calculates the current abbreviation from today’s date.

What is the UTC offset in Illinois?

Illinois is UTC−06:00 during Central Standard Time and UTC−05:00 during Central Daylight Time.

Does Illinois observe daylight saving time?

Yes. In 2026, daylight saving time in Illinois runs from March 8 at 2:00 a.m. local time to November 1 at 2:00 a.m. local time.

Does the time zone change between Illinois and Indiana?

Sometimes. Illinois stays on Central Time, while Indiana is divided between Central and Eastern Time. The exact Indiana destination determines whether you change clocks after crossing the state line.

What IANA time zone should I use for Illinois?

Use America/Chicago for current and future Illinois civil-time calculations. It applies the correct Central Time UTC offset and U.S. daylight-saving transitions for the requested date.