India Standard Time
IST means UTC+05:30 throughout the year.
Other meanings: Israel Standard Time · Irish Standard Time.
TIME ZONE CONVERTER
IST to Lisbon
Time Converter
Convert India Standard Time to Lisbon, Portugal. Compare dates, seasonal differences and meeting hours.
IST is 4h 30m or 5h 30m ahead of Lisbon in 2026, depending on the date.
9 AM IST = 3:30 AM Lisbon
Selected date: November 10, 2026. Fixed abbreviations retain their stated UTC offsets.
THE QUICK REFERENCE
CSVIST to Lisbon conversion table
November 10, 2026 · Date changes are marked.
View the full 24-hour table
| IST | Lisbon |
|---|---|
| 12:00 AM | 6:30 PM -1 day |
| 1:00 AM | 7:30 PM -1 day |
| 2:00 AM | 8:30 PM -1 day |
| 3:00 AM | 9:30 PM -1 day |
| 4:00 AM | 10:30 PM -1 day |
| 5:00 AM | 11:30 PM -1 day |
| 6:00 AM | 12:30 AM |
| 7:00 AM | 1:30 AM |
| 8:00 AM | 2:30 AM |
| 9:00 AM | 3:30 AM |
| 10:00 AM | 4:30 AM |
| 11:00 AM | 5:30 AM |
| IST | Lisbon |
|---|---|
| 12:00 PM | 6:30 AM |
| 1:00 PM | 7:30 AM |
| 2:00 PM | 8:30 AM |
| 3:00 PM | 9:30 AM |
| 4:00 PM | 10:30 AM |
| 5:00 PM | 11:30 AM |
| 6:00 PM | 12:30 PM |
| 7:00 PM | 1:30 PM |
| 8:00 PM | 2:30 PM |
| 9:00 PM | 3:30 PM |
| 10:00 PM | 4:30 PM |
| 11:00 PM | 5:30 PM |
Starting with the Lisbon working day
These examples start on 2026-11-10 in Lisbon.
09:00 Lisbon14:30 →IST · 2026-11-10
17:00 Lisbon22:30 →IST · 2026-11-10
Which time-zone meaning are we using?
ONE CLOCK TIME. THE WHOLE YEAR.
Year CSV09:00 IST to Lisbon throughout 2026
Keeping 09:00 on the IST clock produces 2 different destination clock/date answers in 2026. The ranges below use IST calendar dates, including transition days.
| Dates in IST · 2026 | Lisbon answer | Source → destination offsets | Explore |
|---|---|---|---|
| Jan 1 – Mar 2887 dates | 03:30Same date | UTC+05:30 → UTC | |
| Mar 29 – Oct 24210 dates | 04:30Same date | UTC+05:30 → UTC+01:00 | |
| Oct 25 – Dec 3168 dates | 03:30Same date | UTC+05:30 → UTC |
Every calendar date is included, not just workdays. Date ranges include both endpoints. Based on IANA 2026e; future rules may change.
DON’T LOSE A DAY
When does IST time become a different date in Lisbon?
Your complete source day: 2026-11-10. Each range shows which destination date to use.
IST · 2026-11-1000:00–05:30UTC+05:30
Lisbon · 2026-11-0918:30–24:00UTC Previous day
IST · 2026-11-1005:30–24:00UTC+05:30
Lisbon · 2026-11-1000:00–18:30UTC Same date
Range starts are included; ends are excluded. 24:00 means midnight at the end of that date. Repeated hours appear separately with their UTC offsets. The strip is proportional to elapsed time.
THE BIGGER PICTURE
2026A year of time differences.
How Lisbon compares with IST throughout 2026.
JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
−5h 30m
−4h 30m
−5h 30m
Lisbon changes its UTC offset in 2026. IST is a fixed offset.
See exact change periods
| From (UTC, inclusive) | Until (UTC, exclusive) | Lisbon vs IST |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 29 Mar 2026, 01:00 UTC | 5h 30m behind |
| 29 Mar 2026, 01:00 UTC | 25 Oct 2026, 01:00 UTC | 4h 30m behind |
| 25 Oct 2026, 01:00 UTC | 1 Jan 2027, 00:00 UTC | 5h 30m behind |
CLOCK CHANGES
What changes at the next clock adjustment?
Exact periods outside the most common difference in 2026
The most frequent difference has Lisbon 4h 30m behind relative to IST. Exceptions:
| From (UTC, inclusive) | Until (UTC, exclusive) | Compared with IST |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 29 Mar 2026, 01:00 UTC | 5h 30m behind |
| 25 Oct 2026, 01:00 UTC | 1 Jan 2027, 00:00 UTC | 5h 30m behind |
PLAN BEYOND A SINGLE DAY
Daily CSVIST–Lisbon working hours through 2026
Every date calculated with your working windows. 261 selected IST workdays; public holidays are not applied.
Least shared time2h 30m
Most common3h 30m
Most shared time3h 30m
Days without a 60-min slot0 / 261
A start time that survives the whole year.
Start a 60-minute meeting in IST 14:30–16:00.
These starts fit both working windows on every selected IST workday in 2026, using a 15-minute start grid. The end of each range is the last valid start.
IST: 09:00–17:00, Mon, Tue, Wed, Thu, Fri. Lisbon: 09:00–17:00, Mon, Tue, Wed, Thu, Fri.
Calculation details and repeated hours
Overnight shifts belong to their start weekday. Host workday means the source calendar date. Repeated local times use the first occurrence.
THE DETAILS THAT MATTER
IST to Lisbon: useful answers
Why is the IST to Lisbon difference sometimes 4h 30m and sometimes 5h 30m?
IST is 4h 30m or 5h 30m ahead of Lisbon in 2026, depending on the date. Lisbon changes its UTC offset in 2026. IST is a fixed offset.
Does the IST–Lisbon time difference change in 2026?
The published rules produce 3 periods with 2 different offsets in 2026. See the annual chart for the exact boundaries of each period.
Does this conversion change the calendar date?
09:00 in IST on 2026-11-10 is 03:30 in Lisbon on 2026-11-10. This selected time stays on the same date in both places. Other times can cross midnight.
Can IST and Lisbon meet during working hours?
Your selected working windows share 2h 30m on 2026-11-10. The planner above checks the whole meeting duration and shows suitable start times. Edit the windows to match your team.
Related time-zone meanings and conversions
Calculated with IANA 2026e. Working hours are your preferences; public holidays and calendar availability are not included. Our methodology