Date code on safale us-05

[fishnfever]

Hello gang, its been along time since I brewed a batch of ale. Getting back into it doing 3 gallon biab. I was wondering if any one could tell me how to read the date code on safale us-05?

I know it has a date when to use it by but how do I tell when it was packaged. I wanted to use Mrmalty and it is asking for this info.


Thanks in advance

 

[seph]

https://www.homebrewtalk.com/f163/safale-dry-yeast-production-date-180291/

https://www.homebrewtalk.com/f163/safale-s-04-mr-malty-calculator-344174/

Hope that helps.

 

[chrisroarshack]

You can look at your date code and also calculate how much loss of viability has occurred since packaging.
For every month after packaging, the packet loses 4% of its cell count. Last packet I bought from my LHBS was dated for 04 2016, so assuming it was produced 04 2014 (two years before its date code), it's lost about 16% of its viable cells.
Multiply 20 (cell density of US-05) by (1-.16)= .84, get 16.8, enter all the required info here (http://www.brewersfriend.com/yeast-pitch-rate-and-starter-calculator/) and BAM, the calculator tells me if I need any more packets.
I do 2.5 gal batches and I can usually get away with just using a whole packet.