What timezone does the Google API use for segmenting metrics by date?

Consider this query for querying keyword metrics daily

https://developers.google.com/google-ads/api/docs/query/overview

          SELECT              ad_group_criterion.criterion_id,             ad_group_criterion.type,             ad_group_criterion.keyword.text,             ad_group_criterion.keyword.match_type,             ad_group_criterion.status,             metrics.clicks,             metrics.impressions,             metrics.average_cost,             metrics.cost_micros,             metrics.average_cpm,             metrics.average_cpc,             metrics.ctr         FROM keyword_view         WHERE             segments.date DURING TODAY 

What timezone does the Google API use for segmenting metrics by date?

This was asked here: https://groups.google.com/g/adwords-api/c/XprkF_vnPmA?pli=1 But the answer is not clear.

I've asked the same question on the google developers video as well: https://www.youtube.com/watch?v=zwyFNi7wRgU

I've tried reading the docs on google ads but couldn't find a clear answer