Mutual conversion of time in java8 (LocalDateTime)

1. Convert LocalDateTime to a custom time format string

//localDateTime 代表需要转换的时间;format代表自己定义的时间样式
public static String getDateTimeAsString(LocalDateTime localDateTime, String format) {
    
    
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format);
    return localDateTime.format(formatter);
}

2. Convert long type timestamp to LocalDateTime

// timestamp可以通过long l = System.currentTimeMillis();这种方式去获取到,当然也可以通过其他的方式获取
public static LocalDateTime getDateTimeOfTimestamp(long timestamp) {
    
    
    Instant instant = Instant.ofEpochMilli(timestamp);
    ZoneId zone = ZoneId.systemDefault();
    return LocalDateTime.ofInstant(instant, zone);
}

3. Convert LocalDateTime to long type timestamp

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 a LocalDateTime in a custom time format

// time 是需要被格式化的时间字符串
// format 是自己定义的时间格式
public static LocalDateTime parseStringToDateTime(String time, String format) {
    
    
    DateTimeFormatter df = DateTimeFormatter.ofPattern(format);
    return LocalDateTime.parse(time, df);
}

5. Timestamp to specific time format

// timestamp是时间戳,注意:所有的时间戳均为long类型
// format是自己定义的时间格式
public static String getDateTimeOfTimestamp(long timestamp, String format) {
    
    
Instant instant = Instant.ofEpochMilli(timestamp);
ZoneId zone = ZoneId.systemDefault();
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(format);
return dateTimeFormatter.format(localDateTime);
}

The way to get the timestamp: https://blog.csdn.net/qq_41774102/article/details/126759334csdn_share_tail=%7B%22type%22%3A%22blog%22%2C%22rType%22%3A%22article%22%2C %22rId%22%3A%22126759334%22%2C%22source%22%3A%22qq_41774102%22%7D

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転載: blog.csdn.net/qq_41774102/article/details/126758537