PDT to IST Converter
Convert time between Pacific Daylight Time (PDT) and India Standard Time (IST)
Pacific Daylight Time (PDT)
India Standard Time (IST)
Time Difference
India Standard Time (IST) is 0 hours ahead of Pacific Daylight Time (PDT)
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Select Time
Quick Reference
| PDT | IST |
|---|---|
| 19:00 | 07:30 |
| 21:00 | 09:30 |
| 23:00 | 11:30 |
| 01:00 | 13:30 |
| 03:00 | 15:30 |
| 05:00 | 17:30 |
| 07:00 | 19:30 |
| 09:00 | 21:30 |
| 11:00 | 23:30 |
| 13:00 | 01:30 |
| 15:00 | 03:30 |
| 17:00 | 05:30 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
About PDT to IST Time Conversion
Converting time from Pacific Daylight Time (PDT) to India Standard Time (IST) is essential for coordinating activities between the US West Coast and India. PDT is UTC-7, while IST is UTC+5:30, making IST 12.5 hours ahead of PDT. PDT is the summer time for states like California, Washington, Oregon, and Nevada, running from March to November. India does not observe daylight saving time, so IST remains UTC+5:30 year-round.
This time zone converter uses the IANA timezone database to ensure accurate calculations. IST is one of the few timezones with a 30-minute offset. The PDT-IST pair is one of the most heavily used for Silicon Valley-India tech partnerships, covering product engineering, cloud services, and customer support. During PST (winter), the difference becomes 13.5 hours.
Common Use Cases for PDT to IST Conversion
Business & Work
- Scheduling Silicon Valley-India tech product meetings and standups
- Coordinating San Francisco/Seattle and Bangalore/Hyderabad engineering teams
- Planning international IT and outsourcing project deliveries
Personal & Travel
- Planning travel from the US West Coast to India
- Coordinating with family and friends in India
- Scheduling virtual events for US West Coast-India audiences
Time Zone Information
Pacific Daylight Time (PDT)
- UTC Offset: UTC-7 (UTC-8 during PST in winter)
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Los Angeles, San Francisco, Seattle, Portland, Las Vegas
- Coverage: US West Coast during daylight saving time
India Standard Time (IST)
- UTC Offset: UTC+5:30 (year-round, no daylight saving)
- IANA Timezone: Asia/Kolkata
- Daylight Saving: None - India does not observe daylight saving time
- Major Cities: Delhi, Mumbai, Bangalore, Kolkata, Chennai, Hyderabad
- Coverage: India (entire country uses single unified timezone year-round)
Quick Reference: PDT to IST
Remember: IST is 12.5 hours ahead of PDT. When the US West Coast switches to PST (winter), the difference becomes 13.5 hours. Note the 30-minute offset in IST!
Frequently Asked Questions
What is the time difference between PDT and IST?
Pacific Daylight Time (PDT) is UTC-7, while India Standard Time (IST) is UTC+5:30. IST is 12.5 hours ahead of PDT. When it is 12:00 PM PDT in San Francisco, it is 12:30 AM IST in Delhi the next day.
When does this PDT to IST conversion apply?
PDT is in effect from the second Sunday in March to the first Sunday in November. During US winter, the West Coast uses PST (UTC-8) and the gap with IST becomes 13.5 hours. India does not observe daylight saving, so IST itself never shifts.
Why does IST have a 30-minute offset?
India Standard Time uses UTC+5:30. The country chose one unified timezone despite its east-west span, and the half-hour offset is a compromise between the longitudes at either end.
What are the best times for PDT-IST business calls?
Early morning PDT (7-9 AM) corresponds to evening IST (7:30-9:30 PM), the classic Silicon Valley-India overlap for tech standups. Late evening PDT (9-11 PM) lines up with Indian morning hours, common for distributed engineering teams.
Which regions use PDT?
PDT is observed on the US West Coast during daylight saving time, covering California, Washington, Oregon, Nevada, and parts of Idaho. Canada's British Columbia also uses PDT.
Which regions use IST?
India Standard Time is used across the Republic of India, including all states and union territories. Sri Lanka uses the same UTC+5:30 offset under the name Sri Lanka Standard Time.
Pro Tips
- • IST is 12.5 hours ahead of PDT — add 12 hours 30 minutes and move to the next day for most windows.
- • When the US West Coast falls back to PST, the gap widens to 13.5 hours.
- • Early morning PDT (7-9 AM) is the classic window for Silicon Valley-India engineering calls.
- • India does not observe daylight saving, so only PDT/PST transitions shift the offset.
- • Many US tech companies run overlapping shifts between West Coast and Indian offices using this schedule.
- • Mind the 30-minute IST offset — some calendar tools will silently round it away.