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// 设置每周的第一天从周日开始
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extension StartOfWeek on DateTime {
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DateTime startOfWeek({int startOfWeekDay = DateTime.sunday}) {
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int diff = (7 + (weekday - startOfWeekDay)) % 7;
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DateTime dt = add(Duration(days: -diff));
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return DateTime(dt.year, dt.month, dt.day);
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}
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}
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