Java前后端时间处理全攻略(从格式化到时区转换)

import dayjs from 'dayjs';

const formatDateTime = (timeStr) => {
  if (!timeStr) return '-'; // 空值返回占位符
  return dayjs(timeStr).format('YYYY-MM-DD HH:mm:ss');
};

const formatDateTime = (timeStr) => {
  if (!timeStr || timeStr === 'null' || timeStr === 'undefined') return '-';
  try {
    const date = dayjs(timeStr);
    return date.isValid() ? date.format('YYYY-MM-DD HH:mm:ss') : '-';
  } catch (e) {
    console.error('时间格式化失败:', e);
    return '-';
  }
};

npm install dayjs utc plugin

import utc from 'dayjs/plugin/utc';
import timezone from 'dayjs/plugin/timezone';

dayjs.extend(utc);
dayjs.extend(timezone);

// 转换为北京时间
const beijingTime = dayjs.utc(timeStr).tz('Asia/Shanghai').format('YYYY-MM-DD HH:mm:ss');

const columns = [
  {
    title: '抓取时间',
    dataIndex: 'graspingTime',
    key: 'graspingTime',
    render: (text) => formatDateTime(text), // 直接调用格式化函数
  },
];

import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.Date;

public String formatGraspingTime(Date graspingTime) {
    if (graspingTime == null) {
        return "-";
    }
    // 转换为系统默认时区
    ZonedDateTime zonedDateTime = graspingTime.toInstant()
            .atZone(ZoneId.systemDefault());
    // 格式化
    return zonedDateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
}

ZonedDateTime zonedDateTime = graspingTime.toInstant()
        .atZone(ZoneId.of("Asia/Shanghai"));

public String formatGraspingTime(Date graspingTime) {
    if (graspingTime == null) {
        return "-";
    }
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    sdf.setTimeZone(TimeZone.getTimeZone("Asia/Shanghai")); // 设置时区
    return sdf.format(graspingTime);
}

public class MyEntityDTO {
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
    private Date graspingTime;
    // Getter/Setter
}