There is no overlap between 09:00–18:00 working days in these two places.
How many hours is CST behind PHST?
As abbreviations, PHST is always 14 hours ahead of CST: CST is UTC−6 and PHST is UTC+8. To convert, add 14 hours.
When the CST to PHST time difference changes
For most of the year PHST is 13 hours ahead of CST. From 1 November to 31 December 2026, PHST is 14 hours ahead of CST 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 CST
Length
1 November 2026 to 31 December 2026
14 hours ahead
61 days
1 January 2027 to 13 March 2027
14 hours ahead
72 days
14 March 2027 to 6 November 2027
13 hours ahead
238 days
7 November 2027 to 31 December 2027
14 hours ahead
55 days
Calling hours for CST and PHST
When PHST is 13 hours ahead of CST: no shared 09:00 to 17:00 hours; try 07:00 in CST (20:00 in PHST).
When PHST is 14 hours ahead of CST: no shared 09:00 to 17:00 hours; try 17:00 in CST (07:00 in PHST).
Frequently asked questions about CST and PHST time
How many hours ahead is PHST of CST?
PHST (UTC+8) is 14 hours ahead of CST (UTC−6).
Does the time difference between CST and PHST change?
Yes. It is usually 13 hours ahead, but changes when one side moves its clocks: 14 hours ahead from 1 November to 31 December 2026; 14 hours ahead from 1 January to 13 March 2027.