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{{YEAR|1999}}
gives "1999"
{{YEAR|1999-12-12}}
gives "1999"
{{YEAR|1999-2001}}
gives "1999"
{{YEAR|January 1999}}
gives "1999"
{{YEAR|1 January 1999}}
gives "1999"
{{YEAR|January 1, 1999}}
gives "1999"