Live offset · Year-round DST · Shareable URL

Time difference
Rome and Kolkata

Live clocks (CET ↔ IST), the current gap, month-by-month offset changes, and a full 24-hour map from Rome to Kolkata.

1

Live gap

See the current offset between Rome and Kolkata, 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 Rome into Kolkata with day-shift cues.

Time difference workspace

How Rome and Kolkata line up today.

2 cities · live offsetGap shifts yearly
City pair

Rome Kolkata

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

Live offsetIANA zones · updates automatically
Rome
Europe/Rome
ZoneCET / CEST
Offset nowUTC+2
Hour gap
+3:30

KolkataRome

Kolkata
Asia/Kolkata
ZoneIST
Offset nowUTC+5:30
About this pairUseful when planning calls or docs

Time difference between Rome and Kolkata: Kolkata is currently 4.5 hours ahead of Rome.

This difference is not constant: in winter Rome is 4.5 hours behind Kolkata, while in summer (when one or both observe DST) the gap shifts to 3.5 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 nowEurope/Rome · Asia/Kolkata
Rome
Europe/Rome
Live time
--:--
OffsetUTC+2
AbbreviationCET / CEST
Observes DST
Kolkata
Asia/Kolkata
Live time
--:--
OffsetUTC+5:30
AbbreviationIST
No DST
Relationship

Kolkata is 3.5h ahead of Rome.

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

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

Offset changes by month

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

2026 calendar

Month-by-month gap

MonthDifference (Kolkata vs Rome)
January+4.5h
February+4.5h
March+4.5h
April+3.5h
May+3.5h
June+3.5h
July+3.5h
August+3.5h
September+3.5h
October+3.5h
November+4.5h
December+4.5h
Hour by hour

24-hour conversion table

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

RomeKolkata

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

Rome with part-of-day icon
Kolkata 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 Rome, Kolkata, or this corridor.

FAQ

Frequently asked questions

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

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