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1、Monday 1 January, 1st Sunday, 1–7 days of year yes UK Monday 4 January, 1st Thursday, 4–7 days of year no Most of Europe ISO 8601(1988), European Norm EN 28601 (1992) Monday 7 January, 1st Monday, 7 days of year no Wednesday 1 January, 1st Tuesday, 1–7 days of year yes [citation needed] Saturday 1 January, 1st Friday, 1–7 days of year yes Sunday 1 January, 1st Saturday, 1–7 days of year yes USA[citation needed]。

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