CST to HST
-4hCST
CSTSOURCEHST
HSTGreen rows indicate typical business hours (9 AM - 5 PM)
CST and HST on the World Map
The map below highlights the CST (Central Standard Time) and HST (Hawaii Standard 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.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
Comparing Time Zones: CST and HST
CST runs on Central Standard Time (CST) at UTC-06:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts CST 4 hours behind HST — a difference of -4h at the current offsets.
In practice, when it is 9:00 AM in CST it is 5:00 AM in HST. Midnight in CST is 8:00 PM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
CST to HST time conversion table
| CST (CST) | HST (HST) | Day |
|---|---|---|
| 12:00 AM | 8:00 PM | previous day |
| 6:00 AM | 2:00 AM | same day |
| 7:00 AM | 3:00 AM | same day |
| 8:00 AM | 4:00 AM | same day |
| 9:00 AM | 5:00 AM | same day |
| 12:00 PM | 8:00 AM | same day |
| 3:00 PM | 11:00 AM | same day |
| 5:00 PM | 1:00 PM | same day |
| 6:00 PM | 2:00 PM | same day |
| 9:00 PM | 5:00 PM | same day |
Why people convert CST to HST time
- Scheduling a call from CST to HST: a 10:00 AM start in CST lands at 6:00 AM in HST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both CST and HST are inside the 9-to-5 working day between 1:00 PM and 5:00 PM CST time (9:00 AM–1:00 PM HST). That is roughly 4 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in CST is 4:00 PM in HST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM CST" is unambiguous; "3 PM" across a -4h gap is not.
- Block 1:00 PM–5:00 PM CST as the recurring meeting window if you work primarily from CST and need HST 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 HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
Best time to call between CST and HST
Both CST and HST sit inside the 9 AM – 5 PM working day between 1:00 PM–5:00 PM CST, which is 9:00 AM–1:00 PM HST. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
CST and HST overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
CST is 4 hours behind HST (CST UTC-06:00 → HST UTC-10:00). The shared working window is 1:00 PM–5:00 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
HST
Does not observe DST
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 HST?
CST (CST, UTC-06:00) is 4 hours behind HST (HST, UTC-10:00). The gap is currently -4h.
How do I convert CST time to HST time?
Add -4h to CST local time. For example, 9:00 AM in CST is 5:00 AM in HST.
What time is it in HST right now?
HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -4h offset from CST.
What is the best time to call HST from CST?
Call between 1:00 PM and 5:00 PM CST — that maps to 9:00 AM–1:00 PM HST and keeps both parties inside the working day.
Which is behind, CST or HST?
CST is 4 hours behind HST. When it is 12:00 PM in CST it is 8:00 AM in HST.
Does daylight saving time affect the CST–HST difference?
Neither zone observes daylight saving time, so the -4h offset between CST and HST 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 HST?
Not normally. The -4h gap only pushes the date over the previous day.
What is the time difference between CST and HST?
HST is -4h from CST.
What timezone is CST in?
CST operates on its local timezone.
What timezone is HST in?
HST 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 HST timezone?
Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.
What is the UTC offset for HST?
Hawaii Standard Time (HST) is at UTC-10:00.
What should I know about the HST timezone?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
When is it midnight in CST, what time is it in HST?
When it is 12:00 AM (midnight) in CST (CST), it is -4h later in HST (HST).
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See every conversion from CST →·See every conversion from HST →