Clarification on features' dates used for prediction

[cszc]

@lzvam

for example, for label’s datetime 31st Jan 2019, are we allowed any satellite data taken before that date or also form the same date?

In short, you are allowed to use data up-through (i.e. including) the date of prediction. This means that yes, you can use satellite data from the same local date.

The label’s datetime represents the start of a 24 period over which the air quality is averaged. For example, a label with datetime 2019-01-31T08:00:00Z represents an average taken from 2019-01-31T08:00:00Z to 2019-02-01T07:59:00Z (inclusive).

Therefore, you can use satellite data with an endtime on or before 2019-02-01T07:59:00Z for a label with datetime 2019-01-31T08:00:00Z. Note that this is 11:59pm local time (pacific time).