Historical clue formulations

• Advance look, commercially — 2016-08-20
• Sneak peek, informally — 2009-07-08
• Sneak peek: Var. — 2008-04-28
• Sneak peek, modern-style — 2006-08-17
• Channel bought by TV Guide in 1999 — 2006-06-25
• Advance look, informally — 2005-10-10
• Sneak peek: Var. — 2000-05-27
• Sneak showing: Var. — 1995-09-11