HarmonyOS 两个日期怎么比较

dayjs格式化可以直接格式化年月日不用截取，然后HarmonyOS目前没有直接比较的方法，参考demo：

import dayjs from 'dayjs';

@Entry
@Component
struct Index {
  @State time1: number = 1721264850529
  @State time2: number = 1721264861110
  @State str1: string = ""
  @State str2: string = ""
  @State flag: string = ""

  build() {
    RelativeContainer() {
      Column() {
        Text("time1:  " + this.time1.toString())
        Text("time2:  " + this.time2.toString())
        Button("格式化后比较")
          .onClick(() => {
            this.str1 = dayjs(this.time1).format("YYYY-MM-DD")
            this.str2 = dayjs(this.time2).format("YYYY-MM-DD")
            if (this.str1 == this.str2) {
              this.flag = "相等"
            } else {
              this.flag = "不相等"
            }
          })
        Text("转化time1后：  " + this.str1)
        Text("转化time2后：  " + this.str2)
        Text("结果：  " + this.flag)
      }
    }
    .height('100%')
    .width('100%')
  }
}

或者参考以下链接：

https://blog.csdn.net/Stitch_xiao/article/details/138529936

https://ohpm.openharmony.cn/#/cn/detail/@hview%2Fdayjs