--:--:--
—
San Juan · Barbados · Halifax (winter)
Compare working hours worldwide in the meeting planner across time zones.
Difference
CST vs AST
UTC → UTC
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—
Chicago · Houston · Dallas
AST to CST converter
Convert AST to CST time now
Free AST to CST converter. See Atlantic Standard Time and Central Standard Time side by side. Live clocks, a 2 hours gap, meeting hours, and a full-day chart for San Juan and Chicago.
America/Puerto_Rico
—
AST → CST
To · Central Standard Time
—
America/Chicago
Interactive diagram
Watch AST convert into CST
Drag the Atlantic hour. Watch the Central clock change.
Atlantic
9:00 AM AST
—
CST ← AST
Central
—
Full-day chart
AST to CST hourly conversion chart
Full-day table. Tap a row to copy. Labels follow daylight saving.
| Atlantic | Central | UTC offsets |
|---|
Meeting times
Best AST to CST meeting window
Find hours that work on both sides. Then save the slot to your calendar.
Follow along
Step-by-step AST to CST conversion
Four short steps to convert any AST time to CST.
Choose AST time
Select any hour in Atlantic Standard Time. Smart mode uses America/Puerto_Rico.
AST to CST conversion guide
AST to CST conversion guide
This AST to CST converter shows Central Standard Time (UTC−6) for any Atlantic Standard Time (UTC−4) time. Use it to schedule between San Juan and Chicago. Choose Smart DST for live city clocks. Choose Fixed mode when you only want the AST and CST labels.
Atlantic
AST
UTC−4
San Juan · Barbados · Halifax (winter)
AST vs CST—
Central
CST
UTC−6
Chicago · Houston · Dallas
What is AST to CST conversion?
AST to CST conversion turns a AST clock into the matching CST time. Use it for calls, travel, and teams in San Juan and Chicago.
AST to CST time difference
CST is 2 hours behind AST. Subtract 2 hours from the AST time to get CST. The live clocks at the top show the current AST to CST gap.
AST vs CST
AST is UTC−4. CST is UTC−6. They are different names. If a region uses daylight saving, check the live labels.
AST to CST now / current time
Need ast to cst right now? Read the live clocks, or tap Use current time for an instant AST → CST result.
AST to CST time difference
Season / context — tap to explore
See how daylight saving can change this pair.
Atlantic—
—AST → CST
Central—
Quick answers
Atlantic
Atlantic Standard Time (AST)
UTC−4
Atlantic Standard Time (AST) is UTC−4. Smart DST uses the city clock America/Puerto_Rico so daylight saving stays correct for San Juan · Barbados · Halifax (winter).
- Cities: San Juan · Barbados · Halifax (winter)
- City clock: America/Puerto_Rico
- Fixed AST: UTC−4
- On this page it pairs with CST (UTC−6)
Central
Central Standard Time (CST)
UTC−6
Central Standard Time (CST) is UTC−6. Smart DST uses America/Chicago for cities such as Chicago · Houston · Dallas.
- Cities: Chicago · Houston · Dallas
- City clock: America/Chicago
- Fixed CST: UTC−6
- From AST: CST is 2 hours behind AST
AST to CST FAQ