IST to Lisbon
-4h 30mIST
ISTSOURCELisbon
WESTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and WEST on the World Map
The map below highlights the IST (India Standard Time) and WEST (Western European Time) timezone regions across the globe.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
- •India uses a single time zone despite spanning 30° of longitude.
- •IST is one of only a handful of time zones with a 30-minute offset.
- •IST is the most populous single time zone in the world with over 1.4 billion people.
- •The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.
WET – Western European Time
UTC+00:00Western European Time (WET) is the time zone for Portugal, Morocco, and the Canary Islands, same as UTC+00:00.
- •Portugal is the only mainland European country in the WET time zone.
- •The Canary Islands are on WET despite being part of Spain (which uses CET).
- •WET is identical to GMT and UTC+00:00.
About Lisbon
WikipediaLisbon operates on Western European Time (WET/WEST), same as London. As Portugal's capital and an emerging tech hub, Lisbon bridges European and Atlantic time zones.
Lisbon has 300 days of sunshine per year and is a major startup hub in Europe.
IST to Lisbon Time Difference – Complete Guide
IST runs on India Standard Time (IST) at UTC+05:30. Lisbon runs on Western European Summer Time (WEST) at UTC+01:00, also currently on daylight saving time. That puts IST 4 hours 30 minutes behind Lisbon — a difference of -4h 30m at the current offsets.
In practice, when it is 9:00 AM in IST it is 4:30 AM in Lisbon. Midnight in IST is 7:30 PM in Lisbon.Lisbon observes daylight saving time while IST does not, so the gap narrows or widens by an hour part of the year.
IST to Lisbon time conversion table
| IST (IST) | Lisbon (WEST) | Day |
|---|---|---|
| 12:00 AM | 7:30 PM | previous day |
| 6:00 AM | 1:30 AM | same day |
| 7:00 AM | 2:30 AM | same day |
| 8:00 AM | 3:30 AM | same day |
| 9:00 AM | 4:30 AM | same day |
| 12:00 PM | 7:30 AM | same day |
| 3:00 PM | 10:30 AM | same day |
| 5:00 PM | 12:30 PM | same day |
| 6:00 PM | 1:30 PM | same day |
| 9:00 PM | 4:30 PM | same day |
Why people convert IST to Lisbon time
- Scheduling a call from IST to Lisbon: a 10:00 AM start in IST lands at 5:30 AM in Lisbon, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both IST and Lisbon are inside the 9-to-5 working day between 1:30 PM and 5:00 PM IST time (9:00 AM–12:30 PM WEST). That is roughly 3 hours 30 minutes of usable overlap.
- Coordinating a IST-based team with Lisbon contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a -4h 30m gap is not.
- Block 1:30 PM–5:00 PM IST as the recurring meeting window if you work primarily from IST and need Lisbon colleagues present.
- Lisbon: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
About IST (India Standard Time)
India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.
About WET (Western European Time)
Western European Time (WET) is used in Portugal, the Canary Islands (Spain), Morocco, and several other locations. It is equivalent to GMT/UTC. During summer, Portugal and the Canary Islands switch to WEST (Western European Summer Time, UTC+01:00).
Best time to call between IST and Lisbon
Both IST and Lisbon sit inside the 9 AM – 5 PM working day between 1:30 PM–5:00 PM IST, which is 9:00 AM–12:30 PM WEST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
IST and Lisbon overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
IST is 4 hours 30 minutes behind Lisbon (IST UTC+05:30 → WEST UTC+01:00). The shared working window is 1:30 PM–5:00 PM IST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
IST
Does not observe DST
Lisbon
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between IST and Lisbon?
IST (IST, UTC+05:30) is 4 hours 30 minutes behind Lisbon (WEST, UTC+01:00). The gap is currently -4h 30m.
How do I convert IST time to Lisbon time?
Add -4h 30m to IST local time. For example, 9:00 AM in IST is 4:30 AM in Lisbon.
What time is it in Lisbon right now?
Lisbon uses WEST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -4h 30m offset from IST.
What is the best time to call Lisbon from IST?
Call between 1:30 PM and 5:00 PM IST — that maps to 9:00 AM–12:30 PM WEST and keeps both parties inside the working day.
Which is behind, IST or Lisbon?
IST is 4 hours 30 minutes behind Lisbon. When it is 12:00 PM in IST it is 7:30 AM in Lisbon.
Do IST and Lisbon use different time zones?
IST uses IST at UTC+05:30, while Lisbon (Portugal) uses WEST at UTC+01:00. The IANA identifiers are Asia/Kolkata and Europe/Lisbon.
Does daylight saving time affect the IST–Lisbon difference?
Yes at the moment: Lisbon is on daylight saving time and IST is not, so the -4h 30m gap shifts by an hour when exactly one of them changes clocks.
Which other cities share IST's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, IST's zone?
IST is used in India, Sri Lanka.
Is there a day difference between IST and Lisbon?
Not normally. The -4h 30m gap only pushes the date over the previous day.
What is the time difference between IST and Lisbon?
Lisbon is -4h 30m from IST.
What timezone is IST in?
IST operates on its local timezone.
What timezone is Lisbon in?
Lisbon operates on Western European Time (WET/WEST), same as London. As Portugal's capital and an emerging tech hub, Lisbon bridges European and Atlantic time zones.
What are the business hours in Lisbon?
Standard business hours in Lisbon are 9:00 AM - 6:00 PM WET.
Which countries use IST (India Standard Time)?
IST is used in India, Sri Lanka.
Does IST observe daylight saving time?
No, IST does not observe daylight saving time and remains at UTC+05:30 year-round.
What are some interesting facts about IST?
India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT. India uses a single time zone despite spanning 30° of longitude.
Which cities are in the WET timezone?
Major cities in the WET timezone include Lisbon, Porto, Casablanca, Las Palmas, Funchal, Rabat.
What is the UTC offset for WET?
Western European Time (WET) is at UTC+00:00. During daylight saving time, it shifts to WEST.
What should I know about the WET timezone?
Portugal is the only mainland European country in the WET time zone. The Canary Islands are on WET despite being part of Spain (which uses CET).
When is it midnight in IST, what time is it in Lisbon?
When it is 12:00 AM (midnight) in IST (IST), it is -4h 30m later in Lisbon (WET).
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