Historical clue formulations

• Like bills in arrears — 2022-08-14
• Like bills that are overdue — 2019-09-03
• Like many internships — 2018-11-06
• Like some leaves — 2009-08-15
• Open, in a way — 2003-07-24
• Outstanding — 2003-06-01
• Pro bono — 2003-03-07