While playing with the RESTBase endpoint [[ https://wikimedia.org/api/rest_v1/#!/Pageviews_data/get_metrics_pageviews_per_article_project_access_agent_article_granularity_start_end | /metrics/pageviews/per-article/{project}/{access}/{agent}/{article}/{granularity}/{start}/{end} ]] of https://wikimedia.org/api/rest_v1/ I noticed that the timestamps for start and end can also be specified in the format YYYYMMDDHH which is used by the tool https://tools.wmflabs.org/pageviews/. This might be something which can be documented.