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The underlying date and time parser understands primarily the formats "GMT+H", "GMT+HHMM", "+HHMM" (and the corresponding variants with "-"), and a very limited subset of Timezone names; Starting with opEvents version 2.0.4 we've extended this to also understand the full set of flavours from the iso8601 standard and the TZ database (aka the Olson TZ database).This means that you can use timezone declarations like "Australia/Brisbane", "+04:30" or "CET" - but please note that the abbreviated versions are not guaranteed to be unique and unambiguous!