preamble_15
Whereas a year is presumed to have 365 days or 365,25 days or (for leap years) 366 days, 52 weeks or 12 equal months; whereas an equal month is presumed to have 30,41666 days;
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Source: EUR-Lex (Cellar) · retrieved 2026-10-22 · Text as adopted (Official Journal); later amendments are not incorporated in this text.