Why does my market data feed provide the closing time for I1 and I30 interval timestamps instead of the start time?

Developer API
1

I am working with a market data feed that provides OHLC (Open, High, Low, Close) data for different intervals, such as I1 (1-minute) and I30 (30-minute) candles. However, I noticed that the timestamps in the feed represent the closing time of the interval rather than the start time.

For example:

  • For a 1-minute interval (I1), the timestamp corresponds to the end of the minute (e.g., 10:01:00 for the interval 10:00:00 to 10:00:59).
  • Similarly, for a 30-minute interval (I30), the timestamp corresponds to the end of the 30-minute period (e.g., 10:30:00 for the interval 10:00:00 to 10:29:59).

My Questions:

  1. Is it standard practice for market data feeds to provide the closing time instead of the start time for interval timestamps? If so, why?
  2. Should I adjust these timestamps to represent the start time when storing the data in my database? (e.g., subtracting 1 minute for I1 or 30 minutes for I30 intervals)
  3. Are there any specific use cases where using the closing time as the timestamp is preferred over the start time?
2

Ok I understand the logic behind it, its just the live candle which is going to be closed after a minute.