We use two different timestamp conventions for our metrics. Some metrics, like PriceUSD, use the "start-of-interval" timestamp, which represents the beginning of a time interval. Many network data metrics account for the value over a daily time interval. For example, suppose our FeeMeanNTV metric, which represents mean fees over an interval of a day, has a timestamp of 2020-12-10 00:00:00. The FeeMeanNtv value represents the mean of fees that occurred from 2020-12-10 00:00:00 to 2020-12-11 00:00:00.