[EquisMetaStock Group] specify closing price for a specific date in exploration editor

[tomas_99999 <no_reply@xxxxxxxxxxxxxxx>]

I am trying to get the closing price in explorer for a specific day.

For example, ref(c,-2) is the closing price 2 days ago.
I would like to get the closing price for 1/1/2002.

Is there a code (or a process) to get such a value?

I need to calculate the ratio of closing prices for specific dates 
to filter values.

Filter:
ref(c, [on 6/1/2002]) / ref(c [on 1/1/2002]) < 0.8
// --- filter securities which decreased 20% between these dates ---

I could use ref(c, -xxx) but the value xxx would have to be 
calculated daily.

Thank you for any help
Tomas




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