BRT to HST Time Converter
HST is 7 hours behind BRT. BRT is UTC-3:00, and HST is UTC-10:00.
Best Time to Call Between BRT and HST
Both zones are inside normal business hours between 4:00 PM and 5:00 PM BRT — that's 9:00 AM to 10:00 AM HST. That's a 1-hour window.
both at work BRT only HST only neither — hours along the strip are BRT.
Common Times Converted
BRT on the left, HST on the right.
BRT to HST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| BRT | HST | Working hours |
|---|---|---|
| 12:00 AM | 5:00 PM prev day | — |
| 1:00 AM | 6:00 PM prev day | — |
| 2:00 AM | 7:00 PM prev day | — |
| 3:00 AM | 8:00 PM prev day | — |
| 4:00 AM | 9:00 PM prev day | — |
| 5:00 AM | 10:00 PM prev day | — |
| 6:00 AM | 11:00 PM prev day | — |
| 7:00 AM | 12:00 AM | — |
| 8:00 AM | 1:00 AM | — |
| 9:00 AM | 2:00 AM | BRT only |
| 10:00 AM | 3:00 AM | BRT only |
| 11:00 AM | 4:00 AM | BRT only |
| 12:00 PM | 5:00 AM | BRT only |
| 1:00 PM | 6:00 AM | BRT only |
| 2:00 PM | 7:00 AM | BRT only |
| 3:00 PM | 8:00 AM | BRT only |
| 4:00 PM | 9:00 AM | Both zones |
| 5:00 PM | 10:00 AM | HST only |
| 6:00 PM | 11:00 AM | HST only |
| 7:00 PM | 12:00 PM | HST only |
| 8:00 PM | 1:00 PM | HST only |
| 9:00 PM | 2:00 PM | HST only |
| 10:00 PM | 3:00 PM | HST only |
| 11:00 PM | 4:00 PM | HST only |
What BRT and HST Actually Are
BRT — Brasília Time
São Paulo, Rio de Janeiro, Brasília, Salvador. Standing at UTC-3:00 as written, and the region does not change its clocks, so that offset holds all year. Brazil abolished daylight saving in 2019, so this offset no longer shifts in the southern summer.
Brazil ran daylight saving for decades before abolishing it in 2019, on the argument that changed electricity consumption patterns had erased the savings.
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
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 BRT
Cities on HST
Frequently Asked Questions
What is the time difference between BRT and HST?
HST is 7 hours behind BRT.
What is 9:00 AM BRT in HST?
9:00 AM BRT is 2:00 AM HST.
What are the best hours to schedule a call between BRT and HST?
Between 4:00 PM and 5:00 PM BRT, which is 9:00 AM to 10:00 AM HST. Both sides are inside normal business hours through that window.
Does the difference between BRT and HST change during the year?
No. Neither region changes its clocks, so this gap is fixed all year round.
Does BRT always mean Brasília Time?
Brazil abolished daylight saving in 2019, so this offset no longer shifts in the southern summer.
Does HST always mean Hawaii Standard Time?
Hawaii does not observe daylight saving, so this offset holds all year.