View the original community article here
Last tested: Jan 21, 2019
In custom filters:
((extract_years(now())=extract_years(${download_stats.timestamp_year})
AND ${download_stats.timestamp_year} <= now())
OR
(((extract_years(now())-1)=extract_years(${download_stats.timestamp_year})
AND ${download_stats.timestamp_year} <= add_years(-1,now()))
AND
(extract_months(${download_stats.timestamp_date}) = extract_months(now())
AND
extract_days(${download_stats.timestamp_date}) <= extract_days(now()))
OR
extract_months(${download_stats.timestamp_date}) < extract_months(now())))
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