Historical clue formulations

• Traditional time to start work — 2019-07-17
• Beginning of many workdays — 2019-03-14
• When many clocks are punched — 2013-03-21
• Standard office-closing time — 2008-06-19
• Morning hour — 2006-01-26
• Two bells in the forenoon watch — 2005-11-03
• Start of many a workday — 2001-11-11