java8中时间的各种转换(LocalDateTime)

喜欢ヅ旅行 2022-03-01 11:46 724阅读 0赞

**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);
    }

**5.时间戳转特定的时间格式**

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);
    
    }