忽略linq查询中DateTime的时间部分

List<DateTime> dateTimeList = new List<DateTime>()
{
    new DateTime(2022, 1, 1, 10, 30, 0),  // 2022-01-01 10:30:00
    new DateTime(2022, 1, 2, 15, 45, 0),  // 2022-01-02 15:45:00
    new DateTime(2022, 1, 3, 8, 0, 0),    // 2022-01-03 08:00:00
};

var query = from dateTime in dateTimeList
            select dateTime.Date;

foreach (var date in query)
{
    Console.WriteLine(date);
}

// 输出结果:
// 2022-01-01
// 2022-01-02
// 2022-01-03