Alignment Research Center (ARC) — Founded Date: Apr 2021

NoteThe Wikidata source directly states the inception date as 'April 2021', which matches the claimed founded date of '2021-04' (April 2021). The date formats are equivalent: '2021-04' is ISO 8601 month-level precision, and 'April 2021' is the same month and year. The source is about the correct entity (Alignment Research Center, Q117834778), and the data point is explicitly stated with a reference to English Wikipedia.