ICT ↔ JST Time Converter

Japan Standard Time (JST) is 2h ahead of Indochina Time (ICT). This comes from ICT sitting at UTC+7 and JST at UTC+9. As a quick reference: when it is 9:00 AM in Bangkok, it is 11:00 AM in Tokyo. At noon in Bangkok (12:00 PM), Tokyo reads 2:00 PM. And 5:00 PM in Bangkok corresponds to 7:00 PM in Tokyo.

To convert ICT to JST by hand, add 2 hours to the ICT time. For example, 12:00 PM ICT becomes 2:00 PM JST. If the result goes past midnight, increment (or decrement) the calendar date accordingly — the converter on this page flags this with a "+1 Day" or "-1 Day" note automatically. For half-hour or 45-minute offsets, just carry the minutes over normally (e.g., 30 extra minutes means the result's minutes increase by 30, rolling over to the next hour if needed).

Japan Standard Time (JST) is 2h ahead of Indochina Time (ICT). Flipped the other way, ICT is 2h behind of JST. A practical example: if someone in Tokyo says "let's meet at noon," that maps to 10:00 AM ICT in Bangkok.

Indochina Time (ICT) is the civil time standard used across Bangkok, Ho Chi Minh City, Hanoi, Phnom Penh and nearby regions. It sits at UTC+7 relative to Coordinated Universal Time (UTC). It does not observe Daylight Saving Time, meaning the UTC offset stays constant at UTC+7 all year — every day of the year. The zone encompasses major cities including Bangkok, Ho Chi Minh City, Hanoi, Phnom Penh, Vientiane, Jakarta, Medan.

Japan Standard Time (JST) is the standard time used in Tokyo, Osaka, Kyoto, Yokohama and surrounding areas. It operates at UTC+9 from UTC. It does not observe Daylight Saving Time — the offset remains fixed at UTC+9 throughout the year with no seasonal adjustment. Cities in this zone include Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka.

No. Neither ICT nor JST observes Daylight Saving Time, so the offset between them stays constant at 2h ahead throughout the entire year. This makes recurring meetings and schedule planning straightforward — no need to adjust for seasonal clock changes on either side.

The ideal meeting window is where standard business hours (roughly 9 AM – 6 PM) overlap in both zones. Given that JST is 2h ahead of ICT, mornings on the earlier side tend to align with afternoons on the later side. As a general rule: aim for 8 AM – 11 AM in the earlier zone to keep both sides in reasonable working hours. See the meeting hours table above for exact recommended slots for this specific pair. Avoid times that push either side before 7 AM or after 9 PM — those are shaded in the table.

Type any time directly into the JST input field in the bidirectional converter above — it calculates the ICT equivalent instantly and works equally well in both directions. Alternatively, subtract 2 hours from the JST time to get the ICT result manually. You can also visit the dedicated reverse page: JST to ICT converter ↗.

For certain hours, the conversion can cross midnight into the next or previous calendar day. When a converted time goes past 11:59 PM or before 12:00 AM, the date changes. The converter on this page shows a "+1 Day" label when the result falls on the next calendar day, and "-1 Day" when it falls the previous day. Always check this when sending calendar invites across these two zones — booking a "Tuesday 3 PM" meeting can accidentally land on Wednesday or Monday in the other zone if you miss the date shift.

Indochina Time (ICT) is used across the following cities and regions: Bangkok, Ho Chi Minh City, Hanoi, Phnom Penh, Vientiane, Jakarta, Medan. The zone covers UTC+7, with no seasonal change — the same offset applies every day of the year. It is one of the standard time zones used for international scheduling and business.

Japan Standard Time (JST) covers Tokyo, Osaka, Kyoto, Yokohama, Nagoya, Sapporo, Fukuoka among other locations. Running at UTC+9 with a fixed, year-round offset, it is the civil time standard for this part of the world. When coordinating across ICT and JST, use the live clocks at the top of this page to confirm the exact current local time in both zones before finalising any schedule.

The UTC+7 offset for Indochina Time was established to align civil time with the solar noon of the region it covers. Time zone boundaries are often drawn along political or geographic lines rather than purely at whole-hour intervals from UTC, which is why some zones like this one carry a non-standard offset.

Yes — the converter on this page is designed for exactly that. The live clocks update every second so you always see the current time in both zones at a glance. The editable input fields let you test any time instantly, and the 24-hour table gives you a quick reference for the whole day. For recurring meetings, the best approach is to pick a slot from the "Best Meeting Hours" table above and then lock it in your calendar with the correct timezone so it self-adjusts for any DST transitions automatically.