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3.8.3.3. Time Zone Offset From

Property Name

TZOFFSETFROM

Purpose

This property specifies the offset that is in use prior to this time zone observance.

Value Type

UTC-OFFSET

Property Parameters

IANA and non-standard property parameters can be specified on this property.

Conformance

This property MUST be specified in "STANDARD" and "DAYLIGHT" sub-components.

Description

This property specifies the offset that is in use prior to this time observance. It is used to calculate the absolute time at which the transition to a given observance takes place. This property MUST only be specified in a "VTIMEZONE" calendar component. A "VTIMEZONE" calendar component MUST include this property. The property value is a signed numeric indicating the number of hours and possibly minutes from UTC. Positive numbers represent time zones east of the prime meridian, or ahead of UTC. Negative numbers represent time zones west of the prime meridian, or behind UTC.

Format Definition

This property is defined by the following notation:

 tzoffsetfrom       = "TZOFFSETFROM" frmparam ":" utc-offset
                      CRLF

 frmparam   = *(";" other-param)

Example

The following are examples of this property

 TZOFFSETFROM:-0500

 TZOFFSETFROM:+1345

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