When convert text data like 20:16:29:99 to time data by custom time format as HH:mm:ss:###. It will be always converted to 20:16:29:990, but 20:16:29:099 should be more resonable.

Now, this is improved in Origin 2025b. System variable @MSD is added. Default is 1.

Note: If using decimal point like “ss.###”, then “###“ will always treat as a normal decimal less than 1. So 20:16:29.99 will always convert to be 20:16:29.990.