Bar-timestamp-convention-opening-or-closing

What should a candle's timestamp be in WL8?

A candle contains price information between "10:25:00 AM—10:26:00 AM." What should the candle's timestamp be? "10:25:00 AM" or "10:26:00 AM".

I know it's a pretty basic question, but I need to clarify because I am working with multiple providers who are not consistent. I believe it must be "10:25:00 AM";

Please confirm.