HST to CST Time Converter
CST is 5 hours ahead of HST. HST is UTC-10:00, and The US Central states are currently on CDT (UTC-5:00).
Best Time to Call Between HST and CST
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 CST. That's a 3-hour window.
both at work HST only CST only neither — hours along the strip are HST.
Common Times Converted
HST on the left, CST on the right.
HST to CST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| HST | CST | 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 | CST only |
| 5:00 AM | 10:00 AM | CST only |
| 6:00 AM | 11:00 AM | CST only |
| 7:00 AM | 12:00 PM | CST only |
| 8:00 AM | 1:00 PM | CST 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 CST 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.
CST — Central Standard Time
Chicago, Houston, Dallas, Mexico City, Winnipeg. Standing at UTC-6:00 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. CST also stands for China Standard Time (UTC+8) and Cuba Standard Time (UTC-5). This page covers the North American one.
Saskatchewan sits inside the Central zone but never changes its clocks, so it matches CST in winter and its neighbors' MDT in summer.
What This Means in Practice
This gap is not fixed
CST 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 CST
Frequently Asked Questions
What is the time difference between HST and CST?
CST is 5 hours ahead of HST. That is the live figure. Taken strictly as written, the gap between HST and CST is 4 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM HST in CST?
9:00 AM HST is 2:00 PM CST.
What are the best hours to schedule a call between HST and CST?
Between 9:00 AM and 12:00 PM HST, which is 2:00 PM to 5:00 PM CST. Both sides are inside normal business hours through that window.
Does the difference between HST and CST change during the year?
Yes. CST 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 CST always mean Central Standard Time?
CST also stands for China Standard Time (UTC+8) and Cuba Standard Time (UTC-5). This page covers the North American one.