halfjaar samen - gedicht door Challot.
half jaar daten
day, week, month, quarter, or half-year before that. Stata’s %ty format records years as numeric values and it codes them the natural way: rather than 0 meaning 1960, 1960 means 1960, and so 2006 also means 2006. [U] 24 Working with dates and times3 24.2 Inputting dates and times
