This value type is used to identify properties that contain an offset from UTC to local time.
This value type is defined by the following notation:
utc-offset = time-numzone
time-numzone = ("+" / "-") time-hour time-minute [time-second]
The PLUS SIGN character MUST be specified for positive UTC offsets (i.e., ahead of UTC). The HYPHEN-MINUS character MUST be specified for negative UTC offsets (i.e., behind of UTC). The
value of "-0000" and "-000000" are not allowed. The time-second, if present, MUST NOT be 60; if absent, it defaults to zero.
No additional content value encoding (i.e., BACKSLASH character encoding, see Section 3.3.11) is defined for this value type.
The following UTC offsets are given for standard time for New York (five hours behind UTC) and Geneva (one hour ahead of UTC):