True when timeZone is an IANA zone name the host's Intl implementation accepts (e.g. "America/New_York"). Empty, unknown, or malformed values return false, so callers can validate before formatting and fall back to a default.
timeZone
Intl
True when
timeZoneis an IANA zone name the host'sIntlimplementation accepts (e.g. "America/New_York"). Empty, unknown, or malformed values return false, so callers can validate before formatting and fall back to a default.