Live offset · Year-round DST · Shareable URL

Time difference
Kolkata and Tokyo

Live clocks (IST ↔ JST), the current gap, month-by-month offset changes (steady this year), and a full 24-hour map from Kolkata to Tokyo.

1

Live gap

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

2

Year-round chart

Neither city shifts clocks seasonally—the gap stays steady through 2026.

3

Hour-by-hour

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

Time difference workspace

How Kolkata and Tokyo line up today.

2 cities · live offsetSteady gap
City pair

Kolkata Tokyo

Tokyo is 3.5h ahead of Kolkata at this moment. Compare live clocks, seasonal DST shifts, and hour-by-hour conversions below.

Live offsetIANA zones · updates automatically
Kolkata
Asia/Kolkata
ZoneIST
Offset nowUTC+5:30
Hour gap
+3:30

TokyoKolkata

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

Time difference between Kolkata and Tokyo: Tokyo is currently 3.5 hours ahead of Kolkata.

This difference stays steady year-round because neither city observes Daylight Saving Time. 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 nowAsia/Kolkata · Asia/Tokyo
Kolkata
Asia/Kolkata
Live time
--:--
OffsetUTC+5:30
AbbreviationIST
No DST
Tokyo
Asia/Tokyo
Live time
--:--
OffsetUTC+9
AbbreviationJST
No DST
Relationship

Tokyo is 3.5h ahead of Kolkata.

Neither city shifts clocks seasonally—expect this relationship to stay fixed unless rules change at the governmental level.

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

Offset changes by month

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

2026 calendar

Month-by-month gap

MonthDifference (Tokyo vs Kolkata)
January+3.5h
February+3.5h
March+3.5h
April+3.5h
May+3.5h
June+3.5h
July+3.5h
August+3.5h
September+3.5h
October+3.5h
November+3.5h
December+3.5h
Hour by hour

24-hour conversion table

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

KolkataTokyo

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

Kolkata with part-of-day icon
Tokyo arrow and converted time
Day
  • 00:00
    03:30
    Same day
  • 01:00
    04:30
    Same day
  • 02:00
    05:30
    Same day
  • 03:00
    06:30
    Same day
  • 04:00
    07:30
    Same day
  • 05:00
    08:30
    Same day
  • 06:00
    09:30
    Same day
  • 07:00
    10:30
    Same day
  • 08:00
    11:30
    Same day
  • 09:00
    12:30
    Same day
  • 10:00
    13:30
    Same day
  • 11:00
    14:30
    Same day
  • 12:00
    15:30
    Same day
  • 13:00
    16:30
    Same day
  • 14:00
    17:30
    Same day
  • 15:00
    18:30
    Same day
  • 16:00
    19:30
    Same day
  • 17:00
    20:30
    Same day
  • 18:00
    21:30
    Same day
  • 19:00
    22:30
    Same day
  • 20:00
    23:30
    Same day
  • 21:00
    00:30
    Next day
  • 22:00
    01:30
    Next day
  • 23:00
    02:30
    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 Kolkata, Tokyo, or this corridor.

FAQ

Frequently asked questions

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

Currently, Tokyo is 3.5h ahead of Kolkata. This may change through the year if either city observes Daylight Saving Time.