What is the time difference between Singapore and Honolulu?

Honolulu is 18 hours behind Singapore. 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 Honolulu from Singapore?

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

Does Singapore observe daylight saving time?

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

Does Honolulu observe daylight saving time?

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

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

It is 18:00 in Honolulu, still on the previous day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Singapore and Honolulu use?

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

Convert Singapore time to Honolulu time

Honolulu is 18 hours behind Singapore right now, so midday in Singapore lands in the evening in Honolulu.

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 Singapore, across for Honolulu.

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

Daylight saving time

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

Singapore

Does not observe daylight saving time

Standard: UTC+8

Honolulu

Does not observe daylight saving time

Standard: UTC-10

When you can actually talk

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

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

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

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

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

Common questions

What is the time difference between Singapore and Honolulu?: Honolulu is 18 hours behind Singapore. 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 Honolulu from Singapore?: Between 09:00–12:00 in Singapore, which is 15:00–18:00 in Honolulu. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Singapore observe daylight saving time?: No. Singapore stays on UTC+8 all year, so its clocks never move.
Does Honolulu observe daylight saving time?: No. Honolulu stays on UTC-10 all year, so its clocks never move.
If it is midday in Singapore, what time is it in Honolulu?: It is 18:00 in Honolulu, still on the previous day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.
Which time zones do Singapore and Honolulu use?: Singapore uses Asia/Singapore, currently UTC+8, and Honolulu uses Pacific/Honolulu, currently UTC-10 (HST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.