localdatetime和datetime

LocalDateTime和DateTime都是Java 8中的日期时间类，用于表示不带时区的日期和时间。它们之间可以相互转换。对于LocalDateTime，我们可以使用`toLocalDate()`和`toLocalTime()`方法将其转换为LocalDate和LocalTime。同样地，我们也可以使用`atTime()`方法将LocalDate和LocalTime合并为LocalDateTime。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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