How many hours is EST behind PHST?
As abbreviations, PHST is always 13 hours ahead of EST: EST is UTC−5 and PHST is UTC+8. To convert, add 13 hours.
Check which label you actually need: EST (Eastern Time is on EDT today). A time written with an abbreviation that is not in use is usually meant as the local time, so convert between the places instead: right now PHST is 12 hours ahead of EST.
When the EST to PHST time difference changes
For most of the year PHST is 12 hours ahead of EST. From 1 November to 31 December 2026, PHST is 13 hours ahead of EST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
| Dates | PHST vs EST | Length |
|---|---|---|
| 8 March 2026 to 31 October 2026 | 12 hours ahead | 238 days |
| 1 November 2026 to 31 December 2026 | 13 hours ahead | 61 days |
| 1 January 2027 to 13 March 2027 | 13 hours ahead | 72 days |
| 14 March 2027 to 6 November 2027 | 12 hours ahead | 238 days |
| 7 November 2027 to 31 December 2027 | 13 hours ahead | 55 days |
Calling hours for EST and PHST
- When PHST is 12 hours ahead of EST: no shared 09:00 to 17:00 hours; try 07:00 in EST (19:00 in PHST).
- When PHST is 13 hours ahead of EST: no shared 09:00 to 17:00 hours; try 07:00 in EST (20:00 in PHST).