Why does timezone data change?
Timezone settings are adopted locally, and there is no world timezone authority. In North America, timezone adoption occurs at the city or county level. A wide variety of local concerns can drive a municipality to alter their timezone: • Large municipal events: For example, the 2006 Commonwealth Games in Sydney. • Voting: For example, Brazil altered their setting for national elections one year. • Religion: For example, the Egyptian time setting is changing for Ramadan in 2007.
