LocalDateTime的使用

1.将LocalDateTime转为自定义的时间格式的字符串

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public static String getDateTimeAsString(LocalDateTime localDateTime, String format) { 　　DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format); 　　return localDateTime.format(formatter); }

2.将long类型的timestamp转为LocalDateTime

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public static LocalDateTime getDateTimeOfTimestamp(long timestamp) { 　　Instant instant = Instant.ofEpochMilli(timestamp); 　　ZoneId zone = ZoneId.systemDefault(); 　　return LocalDateTime.ofInstant(instant, zone); }

3.将LocalDateTime转为long类型的timestamp

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public static long getTimestampOfDateTime(LocalDateTime localDateTime) { 　　ZoneId zone = ZoneId.systemDefault(); 　　Instant instant = localDateTime.atZone(zone).toInstant(); 　　return instant.toEpochMilli(); }

4.将某时间字符串转为自定义时间格式的LocalDateTime

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public static LocalDateTime parseStringToDateTime(String time, String format) { 　　DateTimeFormatter df = DateTimeFormatter.ofPattern(format); 　　return LocalDateTime.parse(time, df); }