What Is the EST to PST Converter?
This tool converts a time in Eastern Standard Time (EST) — the time zone used in cities like New York, Atlanta, and Miami — to Pacific Standard Time (PST), used in Los Angeles, Seattle, and San Francisco. Because the Pacific zone is three hours west of the Eastern zone, PST is always 3 hours behind EST. The converter handles the math, including the wrap-around past midnight.
How to Use It
Enter the EST time using the 24-hour clock: the hour (0–23) and the minute (0–59). The calculator subtracts 3 hours and displays the equivalent PST time. For example, 2 PM EST is entered as hour 14, minute 0, and the result is 11:00 PST.
The Formula Explained
The core rule is simple: \(\text{PST} = \text{EST} - 3\text{ hours}\). To avoid negative times near midnight, the calculator converts everything to total minutes, subtracts 180 minutes, and applies a modulo of 1440 (the number of minutes in a day). This makes 1 AM EST correctly become 22:00 (10 PM) PST on the previous calendar day.
$$\text{PST} = \left(\left(\text{EST Hour} \times 60 + \text{EST Minute} - 180\right) \bmod 1440\right)$$where
$$\left\{ \begin{aligned} \text{PST Hour} &= \left\lfloor \frac{T_{\text{PST}}}{60} \right\rfloor \\ \text{PST Minute} &= T_{\text{PST}} \bmod 60 \end{aligned} \right.$$
Worked Example
Suppose it is 09:30 EST. In minutes that's \(9 \times 60 + 30 = 570\). Subtract 180 → \(390\) minutes. Divide by 60 → 6 hours, remainder 30 minutes. So 09:30 EST = 06:30 PST.
FAQ
Is PST always 3 hours behind EST? Yes — both are standard (winter) times, so the offset is a constant 3 hours. During summer the daylight versions (EDT and PDT) keep the same 3-hour gap.
What happens around midnight? The converter wraps correctly. For instance, 01:00 EST becomes 22:00 PST the prior day.
Does this account for Daylight Saving Time? This tool uses fixed standard-time offsets. The 3-hour difference holds whenever both zones are on the same setting (both standard or both daylight).
