Sri Lanka to Honolulu
-15h 30mSri Lanka
ISTSOURCEHonolulu
HSTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and HST on the World Map
The map below highlights the IST (India Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
- •India uses a single time zone despite spanning 30° of longitude.
- •IST is one of only a handful of time zones with a 30-minute offset.
- •IST is the most populous single time zone in the world with over 1.4 billion people.
- •The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
About Honolulu
WikipediaHonolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
Pearl Harbor memorial receives over 2 million visitors annually.
Sri Lanka vs Honolulu: Offsets, DST and Best Call Times
Sri Lanka runs on India Standard Time (IST) at UTC+05:30. Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. That puts Sri Lanka 15 hours 30 minutes behind Honolulu — a difference of -15h 30m at the current offsets.
In practice, when it is 9:00 AM in Sri Lanka it is 5:30 PM in Honolulu on the previous day. Midnight in Sri Lanka is 8:30 AM in Honolulu. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sri Lanka to Honolulu time conversion table
| Sri Lanka (IST) | Honolulu (HST) | Day |
|---|---|---|
| 12:00 AM | 8:30 AM | previous day |
| 6:00 AM | 2:30 PM | previous day |
| 7:00 AM | 3:30 PM | previous day |
| 8:00 AM | 4:30 PM | previous day |
| 9:00 AM | 5:30 PM | previous day |
| 12:00 PM | 8:30 PM | previous day |
| 3:00 PM | 11:30 PM | previous day |
| 5:00 PM | 1:30 AM | same day |
| 6:00 PM | 2:30 AM | same day |
| 9:00 PM | 5:30 AM | same day |
Why people convert Sri Lanka to Honolulu time
- Scheduling a call from Sri Lanka to Honolulu: a 10:00 AM start in Sri Lanka lands at 6:30 PM in Honolulu the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -15h 30m gap: Sri Lanka and Honolulu have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Honolulu is 5:30 PM in Sri Lanka.
- Watching a live event or market open: Sri Lanka viewers need 5:30 PM in Honolulu to catch a 9:00 AM start there, and 3:30 PM if the event is anchored to Sri Lanka.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a -15h 30m gap is not.
- With a -15h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week Sri Lanka takes the early slot, the next week Honolulu does.
About IST (India Standard Time)
India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.
About HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
Best time to call between Sri Lanka and Honolulu
With a -15h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Honolulu opens at 9:00 AM HST, which is 5:30 PM in Sri Lanka, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Sri Lanka and Honolulu have no shared working hours because of the -15h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
Sri Lanka is 15 hours 30 minutes behind Honolulu (IST UTC+05:30 → HST UTC-10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between Sri Lanka and Honolulu?
Sri Lanka (IST, UTC+05:30) is 15 hours 30 minutes behind Honolulu (HST, UTC-10:00). The gap is currently -15h 30m.
How do I convert Sri Lanka time to Honolulu time?
Add -15h 30m to Sri Lanka local time. For example, 9:00 AM in Sri Lanka is 5:30 PM in Honolulu (previous day).
What time is it in Honolulu right now?
Honolulu uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -15h 30m offset from Sri Lanka.
What is the best time to call Honolulu from Sri Lanka?
There is no shared working-hours window because of the -15h 30m gap. The closest option is 1:00 PM in Sri Lanka, which is 9:30 PM in Honolulu.
Which is behind, Sri Lanka or Honolulu?
Sri Lanka is 15 hours 30 minutes behind Honolulu. When it is 12:00 PM in Sri Lanka it is 8:30 PM in Honolulu.
Do Sri Lanka and Honolulu use different time zones?
Sri Lanka (Sri Lanka) uses IST at UTC+05:30, while Honolulu (USA) uses HST at UTC-10:00. The IANA identifiers are Asia/Colombo and Pacific/Honolulu.
Does daylight saving time affect the Sri Lanka–Honolulu difference?
Neither zone observes daylight saving time, so the -15h 30m offset between Sri Lanka and Honolulu is fixed all year.
Which other cities share Sri Lanka's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, Sri Lanka's zone?
IST is used in India, Sri Lanka.
Is there a day difference between Sri Lanka and Honolulu?
Sometimes. The -15h 30m gap is large enough that 8:00 PM or later in Sri Lanka already falls on the in Honolulu.
What is the time difference between Sri Lanka and Honolulu?
Honolulu is -15h 30m from Sri Lanka.
What timezone is Sri Lanka in?
Sri Lanka operates on its local timezone.
What timezone is Honolulu in?
Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.
What are the business hours in Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
Which countries use IST (India Standard Time)?
IST is used in India, Sri Lanka.
Does IST observe daylight saving time?
No, IST does not observe daylight saving time and remains at UTC+05:30 year-round.
What are some interesting facts about IST?
India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT. India uses a single time zone despite spanning 30° of longitude.
Which cities are in the HST timezone?
Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.
What is the UTC offset for HST?
Hawaii Standard Time (HST) is at UTC-10:00.
What should I know about the HST timezone?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
When is it midnight in Sri Lanka, what time is it in Honolulu?
When it is 12:00 AM (midnight) in Sri Lanka (IST), it is -15h 30m later in Honolulu (HST).
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