1、LocalDateTime --> Date
eg: Instant ins = LocalDateTime.now().atZone(ZoneId.systemDefault()).toInstant();
Date date = Date.from(ins);
2、LocalDate -->Date
首先将LocalDate 转 LocalDateTime , eg: LocalDateTime = LocalDate.now().atStartOfDay(); 然后同上；
3、Date --> LocalDate
eg:LocalDate localDate = LocalDateTime.ofInstant(new Date().toInstant(), ZoneId.systemDefault().toLocalDate());
4、Date --> LocalDateTime
eg:LocalDateTime localDateTime = LocalDateTime.ofInstant(new Date().toInstant(), ZoneId.systemDefault());
5、字符串日期转 LocalDate 和 LocalDateTime
eg: String dateStr = "-10-01 12:00:00";
LocalDate localDate = LocalDate.parse("-10-01 12:00:00", DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));LocalDate localDate1 = LocalDate.parse("-10-01");LocalDate localDate2 = LocalDate.parse("/10/01", DateTimeFormatter.ofPattern("yyyy/MM/dd"));LocalDateTime localDateTime = LocalDateTime.parse("-10-01 12:00:00", DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
注意：DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss") 的格式要与日期字符串格式相互匹配
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