How can I determine the date that corresponds to the position of the progress bar inside my task?
The exBarStart property indicates the starting date of the bar, while the exBarEnd indicates the ending point of the bar. The exBarPercent or exBarPercent100 indicates the percent to display the progress inside the bar. The 0 value corresponds to the exBarStart, while 1 corresponds to the exBarEnd, so the formula Items.ItemBar(exBarStart) + (Items.ItemBar(exBarEnd)-Items.ItemBar(exBarStart))*Items.ItemBar(exBarPercent) determines exactly the date time where progress bar is in the chart.