TZOFFSETTO0100

TZOFFSETTO0100 is a term associated with time zone data, typically used in the context of iCalendar and related time zone specifications. It refers to the TZOFFSETTO property, which defines the offset from Coordinated Universal Time (UTC) for a particular time zone observation.

In iCalendar (RFC 5545), the TZOFFSETTO property indicates the new offset from UTC that applies during a specific period, such as standard time or daylight saving time. The value is expressed as a signed offset in the format ±HHMM, where HH is hours and MM is minutes. A value like +0100 means the time zone is one hour ahead of UTC, while -0100 would be one hour behind.

The specific sequence TZOFFSETTO0100 suggests a TZOFFSETTO value of 0100 (with an implied positive sign in many contexts). In practice, the sign is typically included, as in TZOFFSETTO:+0100, to remove ambiguity. This offset is used in conjunction with TZOFFSETFROM to describe transitions between time zone rules, such as switching from standard time to daylight saving time and back.

TZOFFSETTO is part of the broader VTIMEZONE structure in iCalendar data, which also includes other properties like TZNAME and TZID. Accurate TZOFFSETTO values are essential for correctly converting local times to UTC and for preserving historical and future time zone rules in calendar applications.

See also: VTIMEZONE, TZOFFSETFROM, TZNAME, RFC 5545, iCalendar.