By default, the MarkNowCount property is 1. The control's chart shows the position of the current date-time, only if the MarkNowColor property is not zero (0). Use the MarkNowCount property to specify the number of units of date-time to count from. For instance, you can show the current date-time from 5 seconds to 5 seconds, and so on.  The MarkNowWidth property specifies the width in pixels of the vertical bar that shows the current date-time.  The MarkNowUnit property specifies the unit of time to count for. For instance, you can show the current date-time from current second, to next second, from minute to next minute, and so on. The MarkNowTransparent property specifies the percent of transparency to show the vertical bar that indicates the current date-time. The MarkTodayColor property highlights the current day only. The control fires the DateTimeChanged event when the current date-time is changed.