HST to CDT Time Converter
CDT is 5 hours ahead of HST. HST is UTC-10:00, and CDT is UTC-5:00.
Best Time to Call Between HST and CDT
Both zones are inside normal business hours between 9:00 AM and 12:00 PM HST — that's 2:00 PM to 5:00 PM CDT. That's a 3-hour window.
both at work HST only CDT only neither — hours along the strip are HST.
Common Times Converted
HST on the left, CDT on the right.
HST to CDT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| HST | CDT | Working hours |
|---|---|---|
| 12:00 AM | 5:00 AM | — |
| 1:00 AM | 6:00 AM | — |
| 2:00 AM | 7:00 AM | — |
| 3:00 AM | 8:00 AM | — |
| 4:00 AM | 9:00 AM | CDT only |
| 5:00 AM | 10:00 AM | CDT only |
| 6:00 AM | 11:00 AM | CDT only |
| 7:00 AM | 12:00 PM | CDT only |
| 8:00 AM | 1:00 PM | CDT only |
| 9:00 AM | 2:00 PM | Both zones |
| 10:00 AM | 3:00 PM | Both zones |
| 11:00 AM | 4:00 PM | Both zones |
| 12:00 PM | 5:00 PM | HST only |
| 1:00 PM | 6:00 PM | HST only |
| 2:00 PM | 7:00 PM | HST only |
| 3:00 PM | 8:00 PM | HST only |
| 4:00 PM | 9:00 PM | HST only |
| 5:00 PM | 10:00 PM | — |
| 6:00 PM | 11:00 PM | — |
| 7:00 PM | 12:00 AM next day | — |
| 8:00 PM | 1:00 AM next day | — |
| 9:00 PM | 2:00 AM next day | — |
| 10:00 PM | 3:00 AM next day | — |
| 11:00 PM | 4:00 AM next day | — |
What HST and CDT Actually Are
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.
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.
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 HST
Cities on CDT
Frequently Asked Questions
What is the time difference between HST and CDT?
CDT is 5 hours ahead of HST.
What is 9:00 AM HST in CDT?
9:00 AM HST is 2:00 PM CDT.
What are the best hours to schedule a call between HST and CDT?
Between 9:00 AM and 12:00 PM HST, which is 2:00 PM to 5:00 PM CDT. Both sides are inside normal business hours through that window.
Does the difference between HST and CDT 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 HST always mean Hawaii Standard Time?
Hawaii does not observe daylight saving, so this offset holds all year.
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.