Sri Lanka to MDT
-11h 30mSri Lanka
ISTSOURCEMDT
MDTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and MDT on the World Map
The map below highlights the IST (India Standard Time) and MDT (Mountain Daylight 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.
MDT – Mountain Daylight Time
UTC-06:00Mountain Daylight Time (MDT) is the daylight saving offset in the Mountain Time Zone, 6 hours behind UTC.
- •MDT shares the same offset as CST (UTC-06:00).
- •Arizona does not switch to MDT, remaining on MST.
Everything You Need to Know About Sri Lanka and MDT Time
Sri Lanka runs on India Standard Time (IST) at UTC+05:30. MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. That puts Sri Lanka 11 hours 30 minutes behind MDT — a difference of -11h 30m at the current offsets.
In practice, when it is 9:00 AM in Sri Lanka it is 9:30 PM in MDT on the previous day. Midnight in Sri Lanka is 12:30 PM in MDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sri Lanka to MDT time conversion table
| Sri Lanka (IST) | MDT (MDT) | Day |
|---|---|---|
| 12:00 AM | 12:30 PM | previous day |
| 6:00 AM | 6:30 PM | previous day |
| 7:00 AM | 7:30 PM | previous day |
| 8:00 AM | 8:30 PM | previous day |
| 9:00 AM | 9:30 PM | previous day |
| 12:00 PM | 12:30 AM | same day |
| 3:00 PM | 3:30 AM | same day |
| 5:00 PM | 5:30 AM | same day |
| 6:00 PM | 6:30 AM | same day |
| 9:00 PM | 9:30 AM | same day |
Why people convert Sri Lanka to MDT time
- Scheduling a call from Sri Lanka to MDT: a 10:00 AM start in Sri Lanka lands at 10:30 PM in MDT the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -11h 30m gap: Sri Lanka and MDT have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in MDT is 9:30 PM in Sri Lanka.
- Watching a live event or market open: Sri Lanka viewers need 9:30 PM in MDT to catch a 9:00 AM start there, and 11:30 AM if the event is anchored to Sri Lanka.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a -11h 30m gap is not.
- With a -11h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week Sri Lanka takes the early slot, the next week MDT does.
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 MDT (Mountain Daylight Time)
Mountain Daylight Time (MDT) is observed during summer months in the Mountain Time Zone, except in Arizona which stays on MST year-round. MDT aligns with Central Standard Time (CST) at UTC-06:00.
Best time to call between Sri Lanka and MDT
With a -11h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. MDT opens at 9:00 AM MDT, which is 9:30 PM in Sri Lanka, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Sri Lanka and MDT have no shared working hours because of the -11h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
Sri Lanka is 11 hours 30 minutes behind MDT (IST UTC+05:30 → MDT UTC-06:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Sri Lanka
Does not observe DST
MDT
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 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 Sri Lanka and MDT?
Sri Lanka (IST, UTC+05:30) is 11 hours 30 minutes behind MDT (MDT, UTC-06:00). The gap is currently -11h 30m.
How do I convert Sri Lanka time to MDT time?
Add -11h 30m to Sri Lanka local time. For example, 9:00 AM in Sri Lanka is 9:30 PM in MDT (previous day).
What time is it in MDT right now?
MDT uses MDT at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -11h 30m offset from Sri Lanka.
What is the best time to call MDT from Sri Lanka?
There is no shared working-hours window because of the -11h 30m gap. The closest option is 1:00 PM in Sri Lanka, which is 1:30 AM in MDT.
Which is behind, Sri Lanka or MDT?
Sri Lanka is 11 hours 30 minutes behind MDT. When it is 12:00 PM in Sri Lanka it is 12:30 AM in MDT.
Do Sri Lanka and MDT use different time zones?
Sri Lanka (Sri Lanka) uses IST at UTC+05:30, while MDT uses MDT at UTC-06:00. The IANA identifiers are Asia/Colombo and America/Denver.
Does daylight saving time affect the Sri Lanka–MDT difference?
Neither zone observes daylight saving time, so the -11h 30m offset between Sri Lanka and MDT is fixed all year.
Which other cities share Sri Lanka's time zone?
IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.
Which countries use IST, Sri Lanka's zone?
IST is used in India, Sri Lanka.
Is there a day difference between Sri Lanka and MDT?
Not normally. The -11h 30m gap only pushes the date over the previous day.
What is the time difference between Sri Lanka and MDT?
MDT is -11h 30m from Sri Lanka.
What timezone is Sri Lanka in?
Sri Lanka operates on its local timezone.
What timezone is MDT in?
MDT operates on its local timezone.
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 MDT timezone?
Major cities in the MDT timezone include Denver, Calgary, Edmonton, Salt Lake City, Boise.
What is the UTC offset for MDT?
Mountain Daylight Time (MDT) is at UTC-06:00. During daylight saving time, it shifts to MST.
What should I know about the MDT timezone?
MDT shares the same offset as CST (UTC-06:00). Arizona does not switch to MDT, remaining on MST.
When is it midnight in Sri Lanka, what time is it in MDT?
When it is 12:00 AM (midnight) in Sri Lanka (IST), it is -11h 30m later in MDT (MDT).
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