IST to PDT Converter
Convert time between India Standard Time (IST) and Pacific Daylight Time (PDT)
India Standard Time (IST)
Pacific Daylight Time (PDT)
Time Difference
Pacific Daylight Time (PDT) is 0 hours ahead of India Standard Time (IST)
Select Date
Select Time
Quick Reference
| IST | PDT |
|---|---|
| 07:30 | 18:00 |
| 09:30 | 20:00 |
| 11:30 | 22:00 |
| 13:30 | 00:00 |
| 15:30 | 02:00 |
| 17:30 | 04:00 |
| 19:30 | 06:00 |
| 21:30 | 08:00 |
| 23:30 | 10:00 |
| 01:30 | 12:00 |
| 03:30 | 14:00 |
| 05:30 | 16:00 |
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
Related Time Zone Conversions
About IST to PDT Time Conversion
Converting time between India Standard Time (IST) and Pacific Daylight Time (PDT) is essential for coordinating between India and the US West Coast. IST is UTC+5:30 (consistent year-round, no daylight saving time), while PDT is UTC-7 (observed during daylight saving time, March to November). IST is 12.5 hours ahead of PDT.
This conversion is crucial for tech companies coordinating between Indian offices and Silicon Valley headquarters. Software development teams, startups, and tech enterprises bridging India and West Coast operations rely on accurate time conversions. India Standard Time is unique with its 30-minute offset and does not observe daylight saving time, remaining consistently 12.5 hours ahead of PDT during summer months. When PST is active (UTC-8), the difference becomes 13.5 hours. The substantial time difference makes asynchronous collaboration a key strategy for India-West Coast teams.
Common Use Cases for IST to PDT Conversion
Business & Work
- Scheduling calls between Indian tech offices and Silicon Valley headquarters
- Coordinating software development teams across India and West Coast
- Managing startup operations with teams in India and California tech hubs
- Planning conference calls for product development and engineering teams
Personal & Travel
- Coordinating with family and friends in California or Pacific Northwest
- Planning travel between India and West Coast destinations
- Scheduling virtual meetings with West Coast relatives or business partners
- Arranging online collaboration with West Coast-based colleagues
Time Zone Information
India Standard Time (IST)
- UTC Offset: UTC+5:30
- IANA Timezone: Asia/Kolkata
- Daylight Saving: No daylight saving time (consistent year-round)
- Major Cities: New Delhi, Mumbai, Bangalore, Hyderabad, Chennai, Kolkata
- Coverage: Entire India (single timezone covering entire nation)
Pacific Daylight Time (PDT)
- UTC Offset: UTC-7
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Daylight saving time (second Sunday in March to first Sunday in November)
- Major Cities: Los Angeles, San Francisco, Seattle, San Diego, Portland, Sacramento
- Coverage: Pacific United States and Canada (summer months)
Quick Reference: IST to PDT
Remember: IST is always 12.5 hours ahead of PDT. When PDT ends and PST begins (first Sunday in November), the difference becomes 13.5 hours.
Frequently Asked Questions
What is the time difference between IST and PDT?
India Standard Time (IST) is UTC+5:30, while Pacific Daylight Time (PDT) is UTC-7. This means IST is 12.5 hours ahead of PDT. When you have 10:00 AM in San Francisco (PDT), it's 10:30 PM the same day in India (IST).
Why is there a 30-minute difference (12.5 hours instead of 12 hours)?
India Standard Time has a unique UTC+5:30 offset, which is why the difference is 12.5 hours instead of 12. India deliberately chose this non-standard offset to use a single timezone across the entire country. This 30-minute difference is a distinctive characteristic of Indian timekeeping.
Does India observe daylight saving time like PDT does?
No, India does not observe daylight saving time. India Standard Time remains UTC+5:30 throughout the year. This means IST is consistently 12.5 hours ahead of PDT (March-November) and 13.5 hours ahead of PST (November-March).
When does the 12.5-hour difference change to 13.5 hours?
The difference changes on the first Sunday in November when Pacific Daylight Time (PDT) ends and Pacific Standard Time (PST) begins. From November to March, the difference is 13.5 hours. From March to November (when PDT is active), the difference is 12.5 hours.
What are the overlapping business hours between India and West Coast?
Due to the 12.5-hour difference, overlapping hours are minimal. Early morning India (7-9 AM IST) is late evening West Coast (8:30-10:30 PM PDT). Evening India (6-9 PM IST) is early morning West Coast (5:30-8:30 AM PDT). Many India-West Coast teams rely heavily on asynchronous communication and scheduled handoff meetings.
Why is the India-West Coast timezone difference challenging for teams?
The 12.5-hour difference means almost zero overlap during standard 9-5 working hours. This makes real-time collaboration difficult and requires careful scheduling, documentation, and asynchronous work practices. However, this also enables 24-hour development cycles where Indian teams hand off work to West Coast teams at end of day.
Pro Tips
- • The 12.5-hour difference is one of the largest among major business timezone pairs - plan accordingly and use asynchronous communication heavily.
- • Schedule critical meetings in overlapping windows: 7-9 AM IST (8:30-10:30 PM PDT) or 6-8 PM IST (5:30-7:30 AM PDT).
- • Use written documentation extensively - with minimal real-time overlap, clear written communication becomes essential for alignment.
- • India doesn't observe daylight saving, but US does. Mark November and March transitions to update meeting schedules immediately.
- • Consider split teams with some members in each timezone for round-the-clock coverage and better handoff processes.
- • Use tools like Slack, Jira, and async video updates to maintain continuous communication across the 12.5-hour gap.
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