Live offset · Year-round DST · Shareable URL

Time difference
Boston and Tokyo

Live clocks (EST ↔ JST), the current gap, month-by-month offset changes, and a full 24-hour map from Boston to Tokyo.

1

Live gap

See the current offset between Boston and Tokyo, with IANA-backed clocks updating every second.

2

Year-round chart

DST can shift the gap by an hour twice a year—the 2026 month table shows every change.

3

Hour-by-hour

Scroll the 24-hour table to map any civil hour in Boston into Tokyo with day-shift cues.

Time difference workspace

How Boston and Tokyo line up today.

2 cities · live offsetGap shifts yearly
City pair

Boston Tokyo

Tokyo is 13h ahead of Boston at this moment. Compare live clocks, seasonal DST shifts, and hour-by-hour conversions below.

Live offsetIANA zones · updates automatically
Boston
America/New_York
ZoneEST / EDT
Offset nowUTC-4
Hour gap
+13h

TokyoBoston

Tokyo
Asia/Tokyo
ZoneJST
Offset nowUTC+9
About this pairUseful when planning calls or docs

Time difference between Boston and Tokyo: Tokyo is currently 14 hours ahead of Boston.

This difference is not constant: in winter Boston is 14 hours behind Tokyo, while in summer (when one or both observe DST) the gap shifts to 13 hours behind. The monthly table below shows the exact offset gap month by month. For practical scheduling, jump to the best-time-to-meet page or the 24-hour conversion table below.

Jump aheadPick the view you need next
Best time to meetMonthly offsets24-hour table
Live clocks workspace

Clocks side by side.

Updates every second
Right nowAmerica/New_York · Asia/Tokyo
Boston
America/New_York
Live time
--:--
OffsetUTC-4
AbbreviationEST / EDT
Observes DST
Tokyo
Asia/Tokyo
Live time
--:--
OffsetUTC+9
AbbreviationJST
No DST
Relationship

Tokyo is 13h ahead of Boston.

DST rules can widen or shrink this gap for a few weeks each spring and autumn—the month table below shows how many hours Tokyo sits ahead of or behind Boston through the calendar year.

Next stepsPlan overlap or convert zones
Best time to meet →EST → JST →Overlap Finder →
Year-round

Offset changes by month

Sampled mid-month for 2026. Compares Tokyo versus Boston; a value of +3h means Tokyo is three hours ahead of Boston.

2026 calendar

Month-by-month gap

MonthDifference (Tokyo vs Boston)
January+14h
February+14h
March+13h
April+13h
May+13h
June+13h
July+13h
August+13h
September+13h
October+13h
November+14h
December+14h
Hour by hour

24-hour conversion table

Every civil hour in Boston mapped into Tokyo; day-shift cues follow active DST for both zones today.

BostonTokyo

Hourly wall-clock map for today — midnight crossings show as day shifts.

Boston with part-of-day icon
Tokyo arrow and converted time
Day
  • 00:00
    13:00
    Same day
  • 01:00
    14:00
    Same day
  • 02:00
    15:00
    Same day
  • 03:00
    16:00
    Same day
  • 04:00
    17:00
    Same day
  • 05:00
    18:00
    Same day
  • 06:00
    19:00
    Same day
  • 07:00
    20:00
    Same day
  • 08:00
    21:00
    Same day
  • 09:00
    22:00
    Same day
  • 10:00
    23:00
    Same day
  • 11:00
    00:00
    Next day
  • 12:00
    01:00
    Next day
  • 13:00
    02:00
    Next day
  • 14:00
    03:00
    Next day
  • 15:00
    04:00
    Next day
  • 16:00
    05:00
    Next day
  • 17:00
    06:00
    Next day
  • 18:00
    07:00
    Next day
  • 19:00
    08:00
    Next day
  • 20:00
    09:00
    Next day
  • 21:00
    10:00
    Next day
  • 22:00
    11:00
    Next day
  • 23:00
    12:00
    Next day
Uses your browser's IANA zone data — choose another date in the converter for historical or future days.
Keep exploring

Related pages

More time-difference routes, pairwise best times, triple-city overlaps, and conversions tied to Boston, Tokyo, or this corridor.

FAQ

Frequently asked questions

Offsets between Boston and Tokyo, DST shifts, scheduling, and how we source timezone data—plus how to share this page.

Currently, Tokyo is 13h ahead of Boston. This may change through the year if either city observes Daylight Saving Time.