"t0 - The beginning of the timespan for the data"

[duittenb]

t0  -  String
The beginning of the timespan for the data. The maximum lookback period is 31 days from today.

Nice description but WHAT information is expected? 

A number?  

A date?

What format? 

Example?

Without this information first time API users have no clue what to enter.

This applies to any field in the API. 

[sungod · Accepted solution]

t0 and t1 accept readable timestamps like YYYY-MM-DDThh:mm:ssZ as well as epoch timestamps like 1614688726

timespan is just the number of seconds, i.e. 86400 for a day

You can use this to get epoch timestamps...

https://www.epochconverter.com/

[PhilipDAth]

It's an ISO 8601 timestamp.