CST to CDT
+1hCST
CSTSOURCECDT
CDTGreen rows indicate typical business hours (9 AM - 5 PM)
CST and CDT on the World Map
The map below highlights the CST (Central Standard Time) and CDT (Central Daylight Time) timezone regions across the globe.
CST – Central Standard Time
UTC-06:00Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.
- •CST covers 20 US states fully or partially.
- •Chicago and Houston are the two largest cities in the Central Time Zone.
- •Mexico City, one of the world's most populous cities, operates on CST.
- •CST is 1 hour behind EST and 2 hours ahead of PST.
CDT – Central Daylight Time
UTC-05:00Central Daylight Time (CDT) is the daylight saving offset in the Central Time Zone, 5 hours behind UTC.
- •CDT is the same offset as EST (UTC-05:00), which can cause confusion.
- •CDT runs from the second Sunday in March to the first Sunday in November.
CST to CDT Time Difference – Complete Guide
CST runs on Central Standard Time (CST) at UTC-06:00. CDT runs on Central Daylight Time (CDT) at UTC-05:00. That puts CST 1 hour ahead of CDT — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in CST it is 10:00 AM in CDT. Midnight in CST is 1:00 AM in CDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
CST to CDT time conversion table
| CST (CST) | CDT (CDT) | Day |
|---|---|---|
| 12:00 AM | 1:00 AM | same day |
| 6:00 AM | 7:00 AM | same day |
| 7:00 AM | 8:00 AM | same day |
| 8:00 AM | 9:00 AM | same day |
| 9:00 AM | 10:00 AM | same day |
| 12:00 PM | 1:00 PM | same day |
| 3:00 PM | 4:00 PM | same day |
| 5:00 PM | 6:00 PM | same day |
| 6:00 PM | 7:00 PM | same day |
| 9:00 PM | 10:00 PM | same day |
Why people convert CST to CDT time
- Scheduling a call from CST to CDT: a 10:00 AM start in CST lands at 11:00 AM in CDT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both CST and CDT are inside the 9-to-5 working day between 9:00 AM and 4:00 PM CST time (10:00 AM–5:00 PM CDT). That is roughly 7 hours of usable overlap.
- Coordinating a CST-based team with CDT contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM CST" is unambiguous; "3 PM" across a +1h gap is not.
- Block 9:00 AM–4:00 PM CST as the recurring meeting window if you work primarily from CST and need CDT colleagues present.
About CST (Central Standard Time)
Central Standard Time (CST) covers the central region of North America. It is the second most populous time zone in the US, including major cities like Chicago, Houston, and Dallas. CST is also used in Mexico City and much of Central America including Guatemala, Honduras, El Salvador, and Costa Rica. During summer, most of the US and Canada switch to Central Daylight Time (CDT, UTC-05:00), while Mexico and Central American countries generally remain on CST.
About CDT (Central Daylight Time)
Central Daylight Time (CDT) is observed during summer months in the US and Canadian portions of the Central Time Zone. Clocks are moved forward by one hour, aligning with Eastern Standard Time (EST). Most of Mexico and Central America do not observe CDT, staying on CST year-round.
Best time to call between CST and CDT
Both CST and CDT sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM CST, which is 10:00 AM–5:00 PM CDT. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
CST and CDT share 7 hours of working-hours overlap (9:00 AM–4:00 PM CST), so scheduling a live meeting is straightforward.
CST is 1 hour ahead of CDT (CST UTC-06:00 → CDT UTC-05:00). The shared working window is 9:00 AM–4:00 PM CST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
CST
☀ Currently in DST
Standard: UTC-06:00 · DST: UTC-05:00
Clocks fall back on Sun, Nov 1, 2026
CDT
☀ Currently in DST
Standard: UTC-06:00 · DST: UTC-05:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between CST and CDT?
CST (CST, UTC-06:00) is 1 hour ahead of CDT (CDT, UTC-05:00). The gap is currently +1h.
How do I convert CST time to CDT time?
Add +1h to CST local time. For example, 9:00 AM in CST is 10:00 AM in CDT.
What time is it in CDT right now?
CDT uses CDT at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h offset from CST.
What is the best time to call CDT from CST?
Call between 9:00 AM and 4:00 PM CST — that maps to 10:00 AM–5:00 PM CDT and keeps both parties inside the working day.
Which is ahead, CST or CDT?
CST is 1 hour ahead of CDT. When it is 12:00 PM in CST it is 1:00 PM in CDT.
Does daylight saving time affect the CST–CDT difference?
Neither zone observes daylight saving time, so the +1h offset between CST and CDT is fixed all year.
Which other cities share CST's time zone?
CST also covers Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis and 6 more.
Which countries use CST, CST's zone?
CST is used in United States (Central), Canada (Manitoba, Saskatchewan), Mexico, Guatemala, Honduras, El Salvador, Costa Rica, Nicaragua and 1 more.
Is there a day difference between CST and CDT?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between CST and CDT?
CDT is +1h from CST.
What timezone is CST in?
CST operates on its local timezone.
What timezone is CDT in?
CDT operates on its local timezone.
Which countries use CST (Central Standard Time)?
CST is used in United States (Central), Canada (Manitoba, Saskatchewan), Mexico, Guatemala, Honduras, El Salvador, and 3 more countries.
Does CST observe daylight saving time?
Yes, CST switches to CDT during summer months.
What are some interesting facts about CST?
CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.
Which cities are in the CDT timezone?
Major cities in the CDT timezone include Chicago, Houston, Dallas, Austin, Winnipeg, Nashville.
What is the UTC offset for CDT?
Central Daylight Time (CDT) is at UTC-05:00. During daylight saving time, it shifts to CST.
What should I know about the CDT timezone?
CDT is the same offset as EST (UTC-05:00), which can cause confusion. CDT runs from the second Sunday in March to the first Sunday in November.
When is it midnight in CST, what time is it in CDT?
When it is 12:00 AM (midnight) in CST (CST), it is +1h later in CDT (CDT).
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See every conversion from CST →·See every conversion from CDT →