[Bug]Return timestamp

[VictorPulzz]

Vue2-datepicker version: 3.4.1 Vue version: 2.6.12 Browser: Chrome

When I use timestamp, returns timestamp in milliseconds, how I can return timestamp only seconds?

Steps to reproduce

[mengxiong10]

use a computed value.

<date-time-picker v-model="value" />

  computed: {
    value: {
      get() {
        if (typeof form.planning_date === 'number') {
          return form.planning_date * 1000
        }
        return form.planning_date
      },
      set(val) {
        if (typeof val === 'number') {
          form.planning_date = Math.floor(val / 1000)
        }
        form.planning_date = val
      }
    }
  }