What is converted
A dated India Standard Time wall time is mapped to the same instant in PDT.
IST to PDT Converter
Use the IST to PDT Converter to convert India Standard Time to PDT. Convert India Standard Time to fixed Pacific Daylight Time at UTC-07:00 with the exact difference and calendar rollover shown clearly.
Current conversion
Right now in both time zones
India Standard Time ISTNov 2, 2026 · UTC+05:30
PDT PDTNov 2, 2026 · UTC-07:00
PDT is 12 hours 30 minutes behind India Standard Time. The converted time is on the same calendar date.
PDT
Enter your values, then calculate to see a verified result.
Reference range
How this result is calculated
A clear calculation path based on your inputs.
Inputs usedReview the information used for this result.
Full calculation and sourcesReview the equation, normalized inputs, assumptions, and version.
Versioned calculationFormula v5.0.0
Offset relationship
IST is UTC+05:30 and this page treats PDT as the fixed UTC-07:00 offset, producing a constant 12 hour 30 minute difference.
Important distinction
IST and PDT use the zones or fixed offsets stated on this page.
Choose the IST dateUse the source location date.
Sep 16, 2026Enter IST timeUse the local wall-clock time.
9:00 AMRead PDT time and dayCheck both clock and calendar relationship.
8:30 PM, previous dayInterpretation
represents the same instant as the IST input.
Use the rollover label before scheduling or booking travel.
Meeting suggestions keep the selected duration inside the stated working-hours window.
Continue with your result
Compare, save, or take the next step
Did we solve your problem?Your feedback helps us improve this calculator.
Report a calculation issue IST to PDT Converter: purpose and method
India Standard Time to PDT conversion with selected-date zone rules, minute precision, and explicit calendar rollover.
Keep exploring
Related calculators and resources
PDT to IST ConverterContinue with another reviewed time conversion in the current CalculatorGeek cohort.IST to EST ConverterContinue with another reviewed time conversion in the current CalculatorGeek cohort.IST to Singapore ConverterContinue with another reviewed time conversion in the current CalculatorGeek cohort.Decimal Hours CalculatorConvert meeting and travel durations between clock time and decimal hours.
Method and test recordFormula v5.0.0
- Recorded scope
- Manifest parity, selected-date conversion, minute offset, rollover, reciprocal route, and fixture review
- Publisher
- CalculatorGeek
- Reviewed by
- CalculatorGeek Editorial Team
- Recorded review date
- 2026-09-16
- Next source review
- 2027-03-16
- Definition fixtures
- 5 configured scenarios
- Published examples
- 3 shown below
Recorded method
The CalculatorGeek team normalized the legacy route into the shared engine and checked it with five or more deterministic fixtures across January, July, leap day, year end, and the September reference date.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
Known limitations
- This route treats IST as Asia/Kolkata and PDT as UTC-07:00; the same abbreviation can mean something else elsewhere.
- Supported dates are limited to 1970-01-01 through 2100-12-31 to avoid presenting pre-standard sub-minute historical offsets as modern minute-level precision.
- The meeting window assumes 9:00 AM to 5:00 PM on weekdays in both zones and does not account for holidays or personal schedules.
- Calendar exports preserve the converted UTC instant and the selected event duration.
Reference inputs and expected results
These published examples are separate from the configured definition fixtures and any additional automated assertions. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| Reference-date morning | 09:00 IST, 2026-09-16 | 8:30 PM PDT, previous day |
| January midnight boundary | 00:30 IST, 2026-01-15 | 12:00 PM PDT, previous day |
| July midday rule | 12:00 IST, 2026-07-15 | 11:30 PM PDT, previous day |
Report an issue with this tool. Include the page URL, units, expected answer, and steps to reproduce. Do not include sensitive personal information.
On this page
IST to PDT: direct answer
Pacific Daylight Time on this page means the fixed UTC-07:00 offset. It is always 12 hours 30 minutes behind India Standard Time at UTC+05:30. The route does not switch to Pacific Standard Time; use the displayed date rollover when the result falls on the previous day. Reverse the direction with the PDT to IST Converter, or compare all reviewed routes in the time-zone converter hub.
How the date-aware conversion works
The calculator resolves the selected India Standard Time wall time using Asia/Kolkata, converts it to one UTC instant, and formats that instant using UTC-07:00. This preserves the selected date, minute precision, seasonal rules where configured, and the target calendar day.
Choose date-aware time or a fixed UTC offset
This route resolves India Standard Time through Asia/Kolkata. The selected date determines the applicable UTC offset before the same instant is formatted in PDT.
| Source meaning | Best for | Result behavior |
|---|---|---|
| Date-aware regional time | Meetings, travel, events, deadlines | The UTC offset can change with the selected date; rollover is shown. |
| Fixed UTC offset | Technical timestamps and explicitly stated offsets | The stated offset stays fixed; the target clock and date are calculated from it. |
Calendar-date rollover
12:30 AM in India Standard Time on December 31, 2026 converts to 12:00 PM in PDT, previous day. Always carry the displayed date into invitations and travel plans.
Daylight saving and offset rules
Neither endpoint in this route has a seasonal abbreviation change in the supplied configuration. IANA-backed endpoints are still resolved by the selected date so historical rule changes are not replaced by a present-day shortcut.
Common IST to PDT conversions
These examples use September 16, 2026. Select another date in the calculator when a regional clock change could alter the difference.
| IST | PDT | Calendar relationship |
|---|---|---|
| 12:00 AM | 11:30 AM | Previous day |
| 9:00 AM | 8:30 PM | Previous day |
| 12:00 PM | 11:30 PM | Previous day |
| 5:00 PM | 4:30 AM | Same day |
Plan meetings across both zones
The interactive planner aligns the two local days, marks business hours, reports the shared working-hours window, proposes duration-safe start times, and can add a third IANA zone. Use the calendar-date label as well as the clock value when participants are far apart. For time sheets or project records, convert the session length with the Decimal Hours Calculator.
Abbreviations and minute precision
This pair has a half-hour component, so rounding to whole hours would produce the wrong minute value. Abbreviations such as IST or PDT can identify more than one place; the labels and configured zone or offset on this page control the result. If you intended a different location or abbreviation, choose a location-specific route from the time-zone converter hub.
Inputs, outputs and result meaning
India Standard Time to PDT conversion with selected-date zone rules, minute precision, and explicit calendar rollover.
Inputs
- Date in India Standard Time
- The selected date controls applicable regional time-zone rules. The supported range is 1970-01-01 through 2100-12-31.
- India Standard Time local time
- Enter a local wall-clock time in India Standard Time.
- Display format
- Choose how times appear in the result and conversion table. Available choices are 12-hour clock and 24-hour clock.
Outputs
- PDT
- This is the primary result. It is displayed in PDT. The selected display mode formats the result as a clock time. It appears only when the selected mode supports this result. The same result may be available in another supported unit or display mode.
- PDT relative to IST
- It is displayed in h. The visible value uses up to 2 decimal places according to the output rule.
- IST UTC offset
- It is displayed in h. The visible value uses up to 2 decimal places according to the output rule.
- PDT UTC offset
- It is displayed in h. The visible value uses up to 2 decimal places according to the output rule.
Resolve India Standard Time through IANA zone Asia/Kolkata, convert to UTC, then format the same instant through fixed offset UTC-07:00. Keep the result label, unit, selected mode, and stated limitations together when sharing the answer.
Frequently asked questions
Is PDT ahead of IST?
On September 16, 2026, PDT is 12 hours 30 minutes behind IST. The selected date controls seasonal zones.
Can the date change during this conversion?
Yes. The result states whether the target is on the previous day, same day, next day, or farther away at extreme offsets.
Does this converter handle daylight saving time?
This particular pair has no seasonal rule in its configured endpoints, but selected-date IANA history is retained where available.
Should I use the abbreviation or a city or region?
Use the full location or configured IANA zone when an abbreviation could refer to more than one place. This page states exactly how IST and PDT are interpreted.
What happens during a skipped or repeated local time?
A spring-forward time that never occurs is rejected. When a fall-back transition repeats a clock time, the converter exposes the applicable earlier or later occurrence instead of silently guessing.
What date range is supported?
The public input is deliberately bounded to 1970 through 2100, where the tool can avoid presenting pre-standard sub-minute local offsets as modern minute-level precision.
Sources and review
Zone identifiers and rule history use the IANA Time Zone Database. UTC terminology follows the Bureau International des Poids et Mesures. Validation covers manifest parity, reciprocal routing, five or more dated fixtures, minute offsets, daylight-saving behavior where applicable, and calendar rollover.