Historical clue formulations

• Software accessed via an online browser — 2025-12-10
• Google Sheets, e.g. — 2022-11-16
• Google Calendar, e.g. — 2019-01-27
• Google Docs, e.g. — 2016-11-13
• Google Calendar, e.g., informally — 2013-12-30
• Online program — 2010-10-10