What is the time difference between Honolulu and Singapore?

Singapore is 18 hours ahead of Honolulu. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Singapore from Honolulu?

Between 15:00–18:00 in Honolulu, which is 09:00–12:00 in Singapore. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Honolulu observe daylight saving time?

No. Honolulu stays on UTC-10 all year, so its clocks never move.

Does Singapore observe daylight saving time?

No. Singapore stays on UTC+8 all year, so its clocks never move.

If it is midday in Honolulu, what time is it in Singapore?

It is 06:00 in Singapore, and already the following day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Honolulu and Singapore use?

Honolulu uses Pacific/Honolulu, currently UTC-10 (HST), and Singapore uses Asia/Singapore, currently UTC+8. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Honolulu time to Singapore time

Singapore is 18 hours ahead of Honolulu right now, so midday in Honolulu lands in the morning in Singapore.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Honolulu, across for Singapore.

Honolulu	Singapore
00:00	18:00
01:00	19:00
02:00	20:00
03:00	21:00
04:00	22:00
05:00	23:00
06:00	00:00next day
07:00	01:00next day
08:00	02:00next day
09:00	03:00next day
10:00	04:00next day
11:00	05:00next day
12:00	06:00next day
13:00	07:00next day
14:00	08:00next day
15:00	09:00next day
16:00	10:00next day
17:00	11:00next day
18:00	12:00next day
19:00	13:00next day
20:00	14:00next day
21:00	15:00next day
22:00	16:00next day
23:00	17:00next day

Daylight saving time

Neither Honolulu nor Singapore changes its clocks, so the difference between them is the same every day of the year.

Honolulu

Does not observe daylight saving time

Standard: UTC-10

Singapore

Does not observe daylight saving time

Standard: UTC+8

When you can actually talk

The window is 3 hours wide — 15:00–18:00 in Honolulu, 09:00–12:00 in Singapore.

Honolulu 15:00–18:00Singapore 09:00–12:00

Reference

The zone identifiers and offsets behind everything above.

	Honolulu	Singapore
IANA zone	Pacific/Honolulu	Asia/Singapore
Abbreviation	HST	UTC+8
Standard offset	UTC-10	UTC+8
Daylight offset	—	—
Clock changes this year	0	0
Country	United States	Singapore

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Honolulu and Singapore?: Singapore is 18 hours ahead of Honolulu. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Singapore from Honolulu?: Between 15:00–18:00 in Honolulu, which is 09:00–12:00 in Singapore. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Honolulu observe daylight saving time?: No. Honolulu stays on UTC-10 all year, so its clocks never move.
Does Singapore observe daylight saving time?: No. Singapore stays on UTC+8 all year, so its clocks never move.
If it is midday in Honolulu, what time is it in Singapore?: It is 06:00 in Singapore, and already the following day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.
Which time zones do Honolulu and Singapore use?: Honolulu uses Pacific/Honolulu, currently UTC-10 (HST), and Singapore uses Asia/Singapore, currently UTC+8. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.