Java8时间转换

===java8中时间的各种转换(LocalDateTime)===

1.将LocalDateTime转为自定义的时间格式的字符串

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

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

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

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

链接：https://blog.csdn.net/wsywb111/article/details/79815481