Timezone Converter
Convert times across ASEAN and global timezones instantly. Perfect for remote teams and international meetings. Free, no signup, works offline.
Timezone Converter Tool
No timezones added yet. Use the quick-add buttons or the dropdown above.
How to Use the Timezone Converter
Set your date and time
Defaults to right now in your selected source timezone. Click Set to now to refresh, or type any date and time you need to check — perfect for planning future meetings.
Select your source timezone
Singapore time (SGT, UTC+8) is the default for ASEAN users. Switch to any of the 29 IANA timezones in the From dropdown to set your reference point.
Add target timezones
Click any of the quick-add ASEAN buttons (🇸🇬 SGT, 🇬🇧 GMT, 🇺🇸 EST, etc.) or choose from the dropdown. Add up to 6 timezone rows. Each row shows the converted time, AM/PM, date offset if the day changes, and the current UTC offset.
Check the meeting quality indicator
With 2 or more zones added, a colour-coded badge appears. A green badge means all participants are within business hours (9am–6pm). Yellow means mixed hours. Red means at least one zone falls between 10pm–6am.
Timezones in Southeast Asia — The Complexity Behind UTC+8
Why ASEAN Has So Many Timezones (And One Country With Three)
Southeast Asia spans from UTC+6 to UTC+9 — a deceptively large geographic and political spread for a region often marketed as a unified economic bloc. Myanmar sits at an oddly precise UTC+6:30, a deliberate choice made during the colonial era. The Philippines, Malaysia, and Singapore cluster neatly at UTC+8, while most of mainland ASEAN — Thailand, Vietnam, Indonesia's western islands — runs on UTC+7.
Indonesia is the most striking case. As one of the world's largest archipelagos, spanning over 5,100 km from Sabang to Merauke, Indonesia officially maintains three timezone offsets: WIB (UTC+7) covering Java, Sumatra, and Kalimantan; WITA (UTC+8) covering Bali, Lombok, and Sulawesi; and WIT (UTC+9) covering Papua and the Moluccas. Scheduling an all-hands meeting across Indonesia alone requires managing a 2-hour internal spread.
Malaysia's timezone history is equally fascinating. Until 1982, West Malaysia (Peninsular) operated on UTC+7:30 while East Malaysia (Sabah and Sarawak) used UTC+8. The Malaysian government consolidated everything to UTC+8 in 1982 — a political and economic decision to bind the country across the South China Sea. Singapore moved in lockstep, shifting from its earlier UTC+7:30 to UTC+8 at the same time, preserving the business-critical synchrony between the two economies. Vietnam, despite its north-south geographic length, chose uniformity: UTC+7 year-round across the entire country, simplifying internal logistics at the cost of some astronomical misalignment in southern provinces.
Running Remote Teams Across ASEAN: The Timezone Playbook
The good news for ASEAN-based remote teams: most of the region clusters within just a 1-hour window. Singapore, Malaysia, the Philippines, China, Hong Kong, and Taiwan all sit at UTC+8. Thailand, Vietnam, and Indonesia's western islands are only 1 hour behind. Japan and South Korea add another hour. This tight grouping means that a 9am–6pm Singapore workday overlaps almost perfectly with working hours across the entire ASEAN region — a significant advantage over coordinating with European or American offices.
The challenge arrives when ASEAN teams need to sync with Western counterparts. Singapore (UTC+8) and New York (UTC-5) sit 13 hours apart in standard time — making a shared business hour window nearly impossible without someone working outside their normal day. The "golden window" that APAC-experienced remote teams swear by is 9am–11am Singapore time: it catches end-of-business in London (1pm–3pm GMT) and early morning in Sydney (noon–2pm AEST), though it remains pre-dawn in New York.
Best practices that high-performing ASEAN remote teams use: set a default "reference timezone" (usually SGT or UTC) for all meeting invites and project deadlines; adopt an async-first culture where documentation precedes meetings; record all cross-timezone calls and share transcripts within 24 hours; and use a tool like this one to run a quick sanity-check before sending any calendar invite across three or more time zones.
"Singapore and Malaysia share the same time zone (UTC+8) but are separated by just a 1-hour timezone history — Malaysia moved to match Singapore in 1982 for economic alignment."
Daylight Saving Time: Why ASEAN Doesn't Observe It
Daylight Saving Time (DST) is the practice of advancing clocks by one hour during summer months to extend usable evening daylight. Most ASEAN countries have never adopted it — and for good reason. At tropical latitudes close to the equator, sunrise and sunset times vary by only 20–30 minutes across the entire year. There is simply no long summer twilight to "save." Singapore abolished its brief experiment with DST in 1982 when it moved to UTC+8. Malaysia never adopted it. Thailand, Vietnam, Indonesia, the Philippines — none observe DST.
The complication for ASEAN businesses comes from their partners who do observe DST. Australia's eastern states (NSW, VIC, ACT, SA, TAS) shift clocks forward during October–April of the Southern Hemisphere summer, compressing the gap with Singapore by one hour during that period. New Zealand observes DST similarly. Europe shifts in late March and late October. The United States transitions in early March and early November, with the gap between SGT and New York shifting from 13 to 12 hours during US summer. This converter uses the browser's built-in IANA timezone database and automatically accounts for these DST transitions — no manual adjustment needed.
10 Facts About Time Zones
There are 24 official time zones worldwide — but 38 time offsets when you include half-hour and quarter-hour variations like India (UTC+5:30) and Nepal (UTC+5:45).
Singapore shifted from UTC+7:30 to UTC+8 in 1982 — aligning with Malaysia to facilitate cross-border business and simplify regional scheduling.
Indonesia spans three time zones: WIB (UTC+7, Java/Sumatra), WITA (UTC+8, Bali), and WIT (UTC+9, Papua) — making it one of the most timezone-diverse ASEAN nations.
The International Date Line runs through the Pacific Ocean — crossing it heading east moves you back a day; heading west moves you forward.
China operates on a single national time zone (UTC+8) despite its geographic span of 5 natural time zones — a political decision to symbolise national unity.
Australia observes Daylight Saving Time in some states (NSW, VIC, ACT, SA, TAS) but not others (QLD, WA, NT) — creating complex scheduling for businesses across states.
All ASEAN countries fall within a 3-hour window: the earliest is Myanmar at UTC+6:30 and the latest is parts of Indonesia and the Philippines at UTC+8 or UTC+9.
Nepal (UTC+5:45) and India (UTC+5:30) are the world's only countries with a 45-minute and 30-minute offset from UTC — both deliberate to stay within a single time zone.
Coordinated Universal Time (UTC) replaced Greenwich Mean Time (GMT) as the international standard in 1972 — though both terms are still used interchangeably in everyday language.
The term "time zone" was first proposed by Sir Sandford Fleming in 1879 — a Canadian railway engineer frustrated by the chaos of hundreds of local "sun times" across North America.
Frequently Asked Questions
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SGT (Singapore Standard Time) and MYT (Malaysia Time) are both UTC+8 and are effectively identical. They share the same offset because Malaysia moved its entire country to UTC+8 in 1982 to match Singapore, facilitating cross-border business between Peninsular Malaysia, East Malaysia (Sabah and Sarawak), and Singapore. There is zero time difference between Singapore and Kuala Lumpur.
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Indonesia has three official time zones: WIB (Waktu Indonesia Barat, UTC+7) covering Sumatra, Java, and West/Central Kalimantan; WITA (Waktu Indonesia Tengah, UTC+8) covering Bali, Lombok, Sulawesi, and East/South Kalimantan; and WIT (Waktu Indonesia Timur, UTC+9) covering Papua and the Maluku Islands. This means a 2-hour spread across the Indonesian archipelago.
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Singapore is located just 1.3° north of the equator, where sunrise and sunset times vary by only about 20 minutes across the entire year. Daylight Saving Time was designed for higher latitudes where summer days can be significantly longer than winter days. At tropical latitudes, there is no meaningful daylight to "save." Singapore abolished its last experiment with DST in 1982 and has not observed it since. All ASEAN countries are in the same position and none currently observe DST.
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Singapore (UTC+8) and London (UTC+0 in winter, UTC+1 in summer BST) are 7–8 hours apart. The sweet spot for a shared business-hours window is 4pm–5pm SGT, which corresponds to 8am–9am London time (GMT) in winter, or 9am–10am during British Summer Time. This keeps both parties within comfortable working hours. Earlier Singapore slots push London colleagues to pre-business hours; later SGT slots push Singapore participants past 6pm.
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UTC (Coordinated Universal Time) is the international time standard maintained by atomic clocks and adjusted with leap seconds to stay within 0.9 seconds of solar time. GMT (Greenwich Mean Time) is the older mean solar time at the Royal Observatory in Greenwich, London. In everyday use the two are interchangeable — both are UTC+0. Technically, UTC is the more precise modern standard and is preferred in computing and aviation, while GMT remains in common use for business communication, especially in the UK.
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China spans approximately 5 geographic time zones (roughly UTC+5 to UTC+9), but the People's Republic established a single national standard of UTC+8 (China Standard Time, CST) in 1949 as a symbol of national unity and to simplify administration. This means sunrise in Xinjiang (western China) can occur as late as 10am by the clock, while in Shanghai it rises around 5–6am. Unofficially, Xinjiang often follows "Xinjiang Time" (UTC+6) in daily life, but official and business schedules use CST.
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The US observes DST from the second Sunday in March to the first Sunday in November. During US summer (March–November), Eastern Time is EDT (UTC-4) instead of EST (UTC-5). This shifts the SGT–New York gap from 13 hours to 12 hours. For ASEAN teams, this means a regular 9am New York meeting becomes 9pm SGT in winter and 8pm SGT in summer — a 1-hour shift twice a year. This converter uses the IANA timezone database and automatically handles DST transitions — just set the date and it calculates the correct offset.
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Singapore (UTC+8) is 13 hours ahead of New York during Eastern Standard Time (EST, UTC-5), which runs from November to early March. During US Eastern Daylight Time (EDT, UTC-4), from early March to November, the difference narrows to 12 hours. As a quick rule: if it's 9am in Singapore, it's 8pm the previous evening in New York during winter, and 9pm the previous evening during US summer.
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Yes. This tool uses your browser's built-in
Intl.DateTimeFormatAPI, which is backed by the IANA timezone database — the same authoritative source used by operating systems, calendars, and programming languages worldwide. It correctly handles Daylight Saving Time transitions for all regions that observe them. No external API calls are made — everything runs locally in your browser. For historical dates before 1970, timezone definitions can be more complex; for current and near-future scheduling, accuracy is fully reliable. -
The correct IANA timezone identifier for Singapore is
Asia/Singapore. This maps to UTC+8 year-round (no Daylight Saving Time). When configuring servers, calendar apps, databases, or programming environments, always useAsia/Singaporerather than abbreviations like "SGT" or offsets like "+08:00" — IANA identifiers are unambiguous, handle historical timezone changes correctly, and are universally supported across all major platforms.
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