HST to COT Time Converter
COT is 5 hours ahead of HST. HST is UTC-10:00, and COT is UTC-5:00.
Best Time to Call Between HST and COT
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 COT. That's a 3-hour window.
both at work HST only COT only neither — hours along the strip are HST.
Common Times Converted
HST on the left, COT on the right.
HST to COT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| HST | COT | 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 | COT only |
| 5:00 AM | 10:00 AM | COT only |
| 6:00 AM | 11:00 AM | COT only |
| 7:00 AM | 12:00 PM | COT only |
| 8:00 AM | 1:00 PM | COT 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 COT 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.
COT — Colombia Time
Bogotá, Medellín, Cali, Barranquilla. Standing at UTC-5:00 as written, and the region does not change its clocks, so that offset holds all year.
Colombia briefly tried daylight saving during the energy crisis of 1992-93 and has not repeated it.
What This Means in Practice
A gap you can rely on
Neither region changes its clocks, so this difference holds every day of the year. A recurring meeting booked once stays correct — worth knowing, because most cross-border pairs cannot say that.
Major Cities in Each Zone
Cities on HST
Cities on COT
Frequently Asked Questions
What is the time difference between HST and COT?
COT is 5 hours ahead of HST.
What is 9:00 AM HST in COT?
9:00 AM HST is 2:00 PM COT.
What are the best hours to schedule a call between HST and COT?
Between 9:00 AM and 12:00 PM HST, which is 2:00 PM to 5:00 PM COT. Both sides are inside normal business hours through that window.
Does the difference between HST and COT change during the year?
No. Neither region changes its clocks, so this gap is fixed all year round.
Does HST always mean Hawaii Standard Time?
Hawaii does not observe daylight saving, so this offset holds all year.