UTC to PST Time Converter
Use this converter to easily change time from UTC (Coordinated Universal Time) to PST (Pacific Standard Time). PST is used in the Pacific Time Zone of the United States and Canada, and it's commonly observed in places like Los Angeles and parts of Baja California in Mexico (also known as Zona Noroeste).
UTC to PST Time Conversion Table
| UTC Time | PST Time (Standard Time) |
PDT Time (Daylight Saving) |
Time Zone Offset | Applies To |
|---|---|---|---|---|
| 00:00 (Midnight) | 16:00 (Previous Day) | 17:00 (Previous Day) | UTC-8 / UTC-7 | United States, Canada, Baja California |
| 06:00 | 22:00 (Previous Day) | 23:00 (Previous Day) | UTC-8 / UTC-7 | North America |
| 12:00 (Noon) | 04:00 | 05:00 | UTC-8 / UTC-7 | Los Angeles, San Francisco |
| 18:00 | 10:00 | 11:00 | UTC-8 / UTC-7 | Pacific Time Zone |
| 23:59 | 15:59 | 16:59 | UTC-8 / UTC-7 | Pacific Standard Time / Pacific Daylight Time |
UTC is 8 hours ahead of Pacific Time when it's standard time. During Daylight Saving Time (DST), which is also called summer time, the Pacific region switches to PDT (Pacific Daylight Time), making UTC only 7 hours ahead.
This tool helps you convert date and time accurately between these zones, taking into account the time zone offset. Whether you're scheduling meetings or planning events across Mexico and the United States, this converter makes converting UTC simple.
The PST time zone is used in many parts of North America and includes several largest cities. It's also known by its offset: UTC-8 during standard time and UTC-7 during daylight time.
Worked Examples: UTC to PST
Pacific Standard Time (PST) is 8 hours behind Coordinated Universal Time (UTC), so the core operation is subtracting 8 from the UTC hour. The minutes never change. The general formula is:
$$\text{PST hour} = (\text{UTC hour} - 8 + 24) \bmod 24$$
The +24 and mod 24 keep the result in the valid 0–23 range and automatically tell us whether we rolled back to the previous day.
Example 1 — Same day
Convert 15:30 UTC to PST:
$$(15 - 8 + 24) \bmod 24 = 31 \bmod 24 = 7$$
Result: 07:30 PST, same day. Because the raw subtraction \(15 - 8 = 7\) was already 0 or greater, no day change occurs and the indicator reads same day.
Example 2 — Crossing midnight backward
Convert 03:00 UTC to PST:
$$(3 - 8 + 24) \bmod 24 = 19 \bmod 24 = 19$$
Result: 19:00 PST, previous day. Here the raw subtraction \(3 - 8 = -5\) was negative, so we added 24 to get 19 and the indicator reads previous day — 03:00 UTC is the evening before in California.
Example 3 — Midnight UTC
Convert 00:00 UTC to PST:
$$(0 - 8 + 24) \bmod 24 = 16 \bmod 24 = 16$$
Result: 16:00 PST (4:00 PM), previous day. Midnight UTC lands in the late afternoon of the prior calendar day in the Pacific zone.
Key Terms Explained
- UTC (Coordinated Universal Time)
- The global time standard from which all civil time zones are offset. UTC does not change with the seasons and has no daylight saving adjustment, making it the reliable reference point for conversions.
- PST (Pacific Standard Time)
- The standard time of the Pacific Time zone, fixed at UTC−8. PST is the offset used during the winter months. As a standard-time offset, PST itself is constant and does not observe daylight saving.
- PDT (Pacific Daylight Time)
- The daylight saving variant of Pacific Time, UTC−7, used roughly from mid-March to early November in regions that observe daylight saving. If you need the actual current Pacific clock time during summer, you would subtract 7 hours instead of 8. This calculator computes strict PST (UTC−8).
- GMT (Greenwich Mean Time)
- A time standard at the Prime Meridian. For everyday purposes GMT is effectively equal to UTC (the two differ by less than a second), so UTC−8 and GMT−8 describe the same Pacific Standard Time offset.
- Same-day / next-day indicator
- Subtracting 8 hours can push the result back across midnight into the previous calendar day. The indicator flags this: it reads same day when the UTC hour is 8 or greater, and previous day when the UTC hour is 0–7, since those convert to evening hours of the prior date.
How to Convert UTC to PST by Hand
- Write down the UTC time as hours (0–23) and minutes (0–59), for example 03:45.
- Keep the minutes unchanged. The PST offset is a whole number of hours, so the minute value is identical in both zones — 45 stays 45.
- Subtract 8 from the UTC hour. For 03:45 this gives \(3 - 8 = -5\).
- Borrow a day if the result is negative. If the hour is less than 0, add 24 and mark the date as the previous day: \(-5 + 24 = 19\). If the result was already 0 or more, keep it as is and mark same day.
- Format the result. Combine the adjusted hour with the unchanged minutes, padding with leading zeros where needed: 19:45 PST, previous day.
In compact form, this is the single expression \((\text{UTC hour} - 8 + 24) \bmod 24\), where the mod 24 performs the borrowing automatically and any UTC hour from 0 to 7 produces the previous-day flag.
