What's the usage of showCurrentTime in options?

[liaodalin19903]

I use below options

  const options: TimelineOptions = {
    start: baseTime,
    end: new Date(baseTime.getTime() + 4 * 60 * 1000), // 4 min
    min: baseTime,
    max: maxTime,
    format: {
      minorLabels: { second: 'ss', minute: 'mm' },
      majorLabels: { second: 'mm:ss', minute: 'mm:ss' }
    },
    orientation: {
      axis: 'bottom',
      item: 'top'
    },
    stack: false,
    zoomMin: 1000,
    zoomMax: 1000 * 60 * 30,
    tooltip: {
      followMouse: true,
      overflowMethod: 'cap'
    },
    editable: true,
    selectable: true,
    showCurrentTime: true  // I also set to false to compare
  };

I set showCurrentTime: true // I also set to false to compare, but when it's true or false, there is no difference.