How to tell Fermentis yeast date

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ImperialStout

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Just brewed with Frementis US-05 yeast. Brewsmith asks yeast date but there is only what looks like an expiration date, 04-2014, on the package. The other numbers are 78539 114 1459. Am thinking these numbers are a mfg date code or Fermentis has a set shelf life, mfg date being back tracked from the exp date.

Any thoughts?
 

thadass

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From http://www.thescrewybrewer.com/2010/10/yeast-expiration-dates.html

As for the Fermentis yeast expiration dates it's a little different than you might expect. The packets I have on hand have '07 2010 LTBEA' stamped on each packet, which means the yeast was manufactured in '07 2008', so for Fermentis the date is the expiration date. Fermentis claims their yeast is viable for 2 years from the date of manufacture, as long as the yeast is stored properly.
 
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