Java 8 time conversion (localdatetime) code example

This article mainly introduces the java8 time conversion (localdatetime) code example. The example code is introduced in great detail, which has a certain reference value for everyone's study or work. Friends in need can refer to it

1. Convert localdatetime to a custom time format string

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

2. Convert timestamp of long type to localdatetime

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

3. Convert localdatetime to timestamp of long type

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

4. Convert a time string to localdatetime in user-defined time format

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

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