Related Clues:

• January 13, e.g.
• When "et tu" was uttered
• Calendar information
• Movie companion, maybe
• Carbon-14 finding
• 12 days per year
• Word with ''blind'' or ''double''
• The 13th or the 15th
• Watch or cell phone feature
• When 12-Down was uttered
• March 15th, for example
• Bad time of the month
• Bad time of the month?
• November 4, e.g.
• Sweet pastry fruit