// The format is the TZ environment variable without a colon; see
	// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html.
	// Example string, for America/Los_Angeles: PST8PDT,M3.2.0,M11.1.0
	extend string

	// Most lookups will be for the current time.
	// To avoid the binary search through tx, keep a
	// static one-element cache that gives the correct

		`Pacific/Tahiti`,
		`Pacific/Tarawa`,
		`Pacific/Tongatapu`,
		`Pacific/Truk`,
		`Pacific/Wake`,
		`Pacific/Wallis`,
		`Pacific/Yap`,
		`Poland`,
		`Portugal`,
		`PRC`,
		`PST8PDT`,
		`ROC`,
		`ROK`,
		`Singapore`,
		`Turkey`,
		`UCT`,
		`Universal`,
		`US/Alaska`,
		`US/Aleutian`,
		`US/Arizona`,
		`US/Central`,
		`US/East-Indiana`,
		`US/Eastern`,