What is the GMT to PST Converter?
This tool converts a time given in GMT (Greenwich Mean Time, equivalent to UTC) to Pacific Standard Time (PST), the time zone used along the west coast of North America including California, Oregon, Washington, and parts of Canada. PST is fixed at UTC-8, which means it is always 8 hours behind GMT.
How to use it
Enter the GMT hour (0 to 23) and the GMT minute (0 to 59). The converter subtracts 8 hours and wraps the result around the 24-hour clock, then displays the equivalent PST time in both 12-hour (AM/PM) and 24-hour formats.
The formula explained
The core conversion is simply PST = GMT − 8 hours. Because subtracting can push the hour below zero, we apply a modulo-24 wrap:
$$\text{PST Hour} = \left(\text{GMT Hour} - 8 \bmod 24 + 24\right) \bmod 24$$Minutes are unchanged since the offset is a whole number of hours.
$$\text{PST Minute} = \text{GMT Minute}$$
Worked example
Suppose it is 15:30 GMT. Subtract 8 hours: \(15 - 8 = 7\). So the PST time is 07:30, displayed as 7:30 AM. If it were 04:00 GMT, then \(4 - 8 = -4\), which wraps to 20:00 PST, or 8:00 PM the previous day.
FAQ
Is PST the same as PDT? No. PST (UTC-8) applies in winter. During daylight saving (spring–autumn) the West Coast uses PDT (UTC-7), which is only 7 hours behind GMT. This tool computes standard PST.
Is GMT the same as UTC? For everyday conversions, yes — GMT and UTC are treated as identical (UTC+0).
What if my PST time lands on the previous day? When subtracting 8 hours crosses midnight, the clock wraps to the late-evening hours of the prior calendar day.
