Context: The name of local time typically changes when DST is observed. American English replaces standard with daylight: for example, Pacific Standard Time (PST) becomes Pacific Daylight Time (PDT). In the United Kingdom, the standard term for UK time when advanced by one hour is British Summer Time (BST), and British English typically inserts summer into other time zone names, e.g. Central European Time (CET) becomes Central European Summer Time (CEST).

Question: What usually changes when a place observes DST?
Answer: The name of local time

Question: What word does American English swap out for "daylight" when referring to time zones?
Answer: standard

Question: In American English, what is the equivalent of Pacific Standard Time?
Answer: Pacific Daylight Time

Question: When the UK changes their clocks forward in the spring, what do they call the time they're then observing?
Answer: British Summer Time

Question: What word is often added to the names of time zones when used in British English?
Answer: summer