This ProBuilder script is designed to display historical data for each trading day starting from a specified date until the current day. It uses text overlays to export data directly on the chart, which can be useful for visual analysis or for preparing data for optical character recognition (OCR) processes.

defparam drawonlastbaronly=true
startDate = 20190101
once plotted=0
if date=startDate then
    startbar=barindex
endif
if date=today and not plotted then
    for i = 0 to barindex-startbar do
        iday=day[i]
        imonth=month[i]
        iyear=year[i]
        iopen=open[i]
        ihigh=high[i]
        ilow=low[i]
        iclose=close[i]
        y=i*0.1
        drawtext("#iyear#.#imonth#.#iday#;#iopen#;#ihigh#;#ilow#;#iclose#",barindex,y,dialog,standard,12)
    next
    plotted=1
endif
return

Explanation of the code:

• Initialization: The script starts by setting drawonlastbaronly=true to ensure that drawing commands are executed only on the last bar of the chart. This improves performance by not redrawing on every bar.
• Setting the Start Date: startDate is defined with a specific date from which the data export will begin.
• Tracking the Start Bar: The script checks if the current date matches the startDate. If true, it records the bar index at this date in startbar.
• Data Export Loop: When the current date is today and data has not yet been plotted (plotted=0), the script enters a loop from the start bar to the current bar.
• Extracting Data: Inside the loop, it extracts the day, month, year, open, high, low, and close prices for each bar using indexed values like day[i].
• Displaying Data: For each bar, it uses drawtext to display the extracted data on the chart. The y-coordinate is slightly adjusted by i*0.1 to prevent overlapping of text.
• Marking Completion: After plotting the data, plotted is set to 1 to prevent re-plotting the same data.

This script is particularly useful for visually exporting data from a trading chart, which can then be captured and processed externally, such as through OCR technologies.