HarmonyOS 转化时间戳

使用三方库dayjs，参考demo：

import dayjs from "dayjs";
@Entry
@Component
struct TimeDemo {
  getTimeTest():string {
    let currentTimezone = new Date().getTimezoneOffset();
    let durTime = (-480 - currentTimezone ) * 60 * 1000;
    let currentTimeMill = new Date().getTime()
    let currentTimeBeijing = currentTimeMill - durTime;
    let dateStr = dayjs(currentTimeBeijing).format("YYYY-MM-DD HH:mm:ss")
    console.log("BEIJINGTIME = " + dateStr);
    return dateStr;
  }

  build() {
    RelativeContainer() {
      Text(this.getTimeTest())
    }
    .height('100%')
    .width('100%')
  }
}
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参考链接：https://gitee.com/openharmony-tpc/openharmony_tpc_samples/tree/master/dayjs