CLDR xx

UTC offset, basic.

-0700

at the reference instant, Mon, Jan 2 2006, 3:04:05 PM MST

The offset from UTC without a colon (-0700) — RFC 822/ISO 8601 basic form, strftime %z, CLDR xx or ZZZ.

Language	Token	Caveat
C / POSIX strftime	%z	+hhmm or -hhmm; no bytes at all if no timezone is determinable.
CLDR / ICU pattern	xx	A single x drops zero minutes (-08); Z through ZZZ print the same basic form. XX prints Z at UTC instead of +0000.
Go time layout	-0700
Java DateTimeFormatter	Z	Z through ZZZ print +0000-style; ZZZZ switches to GMT+08:00 and ZZZZZ adds a colon and prints Z at UTC.
Moment.js format	ZZ
PHP date()	O
Python strftime	%z	Empty string for naive datetimes; can include seconds/microseconds for exotic offsets.
Ruby strftime	%z
Rust chrono	%z	%#z is parsing-only and tolerates missing minutes.