CDT to HST Time Converter
HST is 5 hours behind CDT. CDT is UTC-5:00, and HST is UTC-10:00.
Best Time to Call Between CDT and HST
Both zones are inside normal business hours between 2:00 PM and 5:00 PM CDT — that's 9:00 AM to 12:00 PM HST. That's a 3-hour window.
both at work CDT only HST only neither — hours along the strip are CDT.
Common Times Converted
CDT on the left, HST on the right.
CDT to HST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| CDT | HST | Working hours |
|---|---|---|
| 12:00 AM | 7:00 PM prev day | — |
| 1:00 AM | 8:00 PM prev day | — |
| 2:00 AM | 9:00 PM prev day | — |
| 3:00 AM | 10:00 PM prev day | — |
| 4:00 AM | 11:00 PM prev day | — |
| 5:00 AM | 12:00 AM | — |
| 6:00 AM | 1:00 AM | — |
| 7:00 AM | 2:00 AM | — |
| 8:00 AM | 3:00 AM | — |
| 9:00 AM | 4:00 AM | CDT only |
| 10:00 AM | 5:00 AM | CDT only |
| 11:00 AM | 6:00 AM | CDT only |
| 12:00 PM | 7:00 AM | CDT only |
| 1:00 PM | 8:00 AM | CDT only |
| 2:00 PM | 9:00 AM | Both zones |
| 3:00 PM | 10:00 AM | Both zones |
| 4:00 PM | 11:00 AM | Both zones |
| 5:00 PM | 12:00 PM | HST only |
| 6:00 PM | 1:00 PM | HST only |
| 7:00 PM | 2:00 PM | HST only |
| 8:00 PM | 3:00 PM | HST only |
| 9:00 PM | 4:00 PM | HST only |
| 10:00 PM | 5:00 PM | — |
| 11:00 PM | 6:00 PM | — |
What CDT and HST Actually Are
CDT — Central Daylight Time
Chicago, Houston, Dallas, Winnipeg. Standing at UTC-5:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to CST. Mexico abolished daylight saving in 2022, so Mexico City stays on UTC-6 all year and no longer uses CDT.
Mexico left this pattern behind in 2022, abolishing daylight saving nationwide except in a strip of cities along the US border that kept it for cross-frontier trade.
HST — Hawaii Standard Time
Honolulu and the rest of Hawaii. Standing at UTC-10:00 as written, and the region does not change its clocks, so that offset holds all year. Hawaii does not observe daylight saving, so this offset holds all year.
Hawaii dropped daylight saving in 1967 and never resumed it. Being close to the equator, its daylight barely varies across the year, so there is little to gain.
What This Means in Practice
This gap is not fixed
CDT changes its clocks and HST does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, November 1, 2026 unless someone resets it.
Major Cities in Each Zone
Cities on CDT
Cities on HST
Frequently Asked Questions
What is the time difference between CDT and HST?
HST is 5 hours behind CDT.
What is 9:00 AM CDT in HST?
9:00 AM CDT is 4:00 AM HST.
What are the best hours to schedule a call between CDT and HST?
Between 2:00 PM and 5:00 PM CDT, which is 9:00 AM to 12:00 PM HST. Both sides are inside normal business hours through that window.
Does the difference between CDT and HST change during the year?
Yes. CDT observes daylight saving and HST does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.
Does CDT always mean Central Daylight Time?
Mexico abolished daylight saving in 2022, so Mexico City stays on UTC-6 all year and no longer uses CDT.
Does HST always mean Hawaii Standard Time?
Hawaii does not observe daylight saving, so this offset holds all year.