What time is 4 AM in Tokyo in San Diego?
Instant time conversion · Japan to United States
When it's 4 AM in Tokyo (GMT+9)…
Tokyo to San Diego — Time Conversion
When it is 4 AM in Tokyo (Japan Standard Time, GMT+9), it is 12 PM in San Diego (Pacific Daylight Time, PDT).San Diego is 16 hours behind Tokyo.
Use the table above to see the equivalent time in San Diego and other major cities worldwide. Click any row to open the full hour page for that destination.
All Tokyo hours → San Diego
Frequently Asked Questions
What time is 4 AM in Tokyo in San Diego?
4 AM Tokyo time (GMT+9) equals 12 PM in San Diego (PDT) — the previous day.
What is the time difference between Tokyo and San Diego?
San Diego is 16 hours behind Tokyo. Tokyo uses Japan Standard Time (GMT+9, UTC+9) and San Diego uses Pacific Daylight Time (PDT, UTC-7).
Is 4 AM Tokyo a good time to call San Diego?
Yes — 4 AM in Tokyo corresponds to 12 PM in San Diego, which is within standard business hours (9 AM–5 PM). This is a good time for international calls.
How do I convert time from Tokyo to San Diego?
To convert Tokyo time to San Diego time, add (-16) hours. For example, 4 AM GMT+9 = 12 PM PDT (previous day).
Other hours — Tokyo to San Diego
Reverse