Live offset · Year-round DST · Shareable URL

Time difference
Kolkata and Sydney

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

1

Live gap

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

Time difference workspace

How Kolkata and Sydney line up today.

2 cities · live offsetGap shifts yearly
City pair

Kolkata Sydney

Sydney is 4.5h 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
+4:30

SydneyKolkata

Sydney
Australia/Sydney
ZoneAEST / AEDT
Offset nowUTC+10
About this pairUseful when planning calls or docs

Time difference between Kolkata and Sydney: Sydney is currently 5.5 hours ahead of Kolkata.

This difference is not constant: in winter Kolkata is 5.5 hours behind Sydney, while in summer (when one or both observe DST) the gap shifts to 4.5 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 nowAsia/Kolkata · Australia/Sydney
Kolkata
Asia/Kolkata
Live time
--:--
OffsetUTC+5:30
AbbreviationIST
No DST
Sydney
Australia/Sydney
Live time
--:--
OffsetUTC+10
AbbreviationAEST / AEDT
Observes DST
Relationship

Sydney is 4.5h ahead of Kolkata.

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

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

Offset changes by month

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

2026 calendar

Month-by-month gap

MonthDifference (Sydney vs Kolkata)
January+5.5h
February+5.5h
March+5.5h
April+4.5h
May+4.5h
June+4.5h
July+4.5h
August+4.5h
September+4.5h
October+5.5h
November+5.5h
December+5.5h
Hour by hour

24-hour conversion table

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

KolkataSydney

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

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

FAQ

Frequently asked questions

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

Currently, Sydney is 4.5h ahead of Kolkata. This may change through the year if either city observes Daylight Saving Time.