HST to PDT Time Converter
PDT is 3 hours ahead of HST. HST is UTC-10:00, and PDT is UTC-7:00.
Best Time to Call Between HST and PDT
Both zones are inside normal business hours between 9:00 AM and 2:00 PM HST — that's 12:00 PM to 5:00 PM PDT. That's a 5-hour window.
both at work HST only PDT only neither — hours along the strip are HST.
Common Times Converted
HST on the left, PDT on the right.
HST to PDT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| HST | PDT | Working hours |
|---|---|---|
| 12:00 AM | 3:00 AM | — |
| 1:00 AM | 4:00 AM | — |
| 2:00 AM | 5:00 AM | — |
| 3:00 AM | 6:00 AM | — |
| 4:00 AM | 7:00 AM | — |
| 5:00 AM | 8:00 AM | — |
| 6:00 AM | 9:00 AM | PDT only |
| 7:00 AM | 10:00 AM | PDT only |
| 8:00 AM | 11:00 AM | PDT only |
| 9:00 AM | 12:00 PM | Both zones |
| 10:00 AM | 1:00 PM | Both zones |
| 11:00 AM | 2:00 PM | Both zones |
| 12:00 PM | 3:00 PM | Both zones |
| 1:00 PM | 4:00 PM | Both zones |
| 2:00 PM | 5:00 PM | HST only |
| 3:00 PM | 6:00 PM | HST only |
| 4:00 PM | 7:00 PM | HST only |
| 5:00 PM | 8:00 PM | — |
| 6:00 PM | 9:00 PM | — |
| 7:00 PM | 10:00 PM | — |
| 8:00 PM | 11:00 PM | — |
| 9:00 PM | 12:00 AM next day | — |
| 10:00 PM | 1:00 AM next day | — |
| 11:00 PM | 2:00 AM next day | — |
What HST and PDT 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.
PDT — Pacific Daylight Time
Los Angeles, San Francisco, Seattle, Vancouver. Standing at UTC-7:00 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 PST.
PDT covers the eight months when the US West Coast is seven hours behind UTC rather than eight.
What This Means in Practice
This gap is not fixed
PDT 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 PDT
Frequently Asked Questions
What is the time difference between HST and PDT?
PDT is 3 hours ahead of HST.
What is 9:00 AM HST in PDT?
9:00 AM HST is 12:00 PM PDT.
What are the best hours to schedule a call between HST and PDT?
Between 9:00 AM and 2:00 PM HST, which is 12:00 PM to 5:00 PM PDT. Both sides are inside normal business hours through that window.
Does the difference between HST and PDT change during the year?
Yes. PDT 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.