To calculate the elapsed # of days between a date field in an Einstein dataset and a string date field, use the daysBetween and toDate functions. The number multipliers have to do with epoch seconds.. Thanks for Pedro Gagliardi for his blog "Mastering Dates on Einstein Analytics using epochs". Here are the calculations.
1 hour = 3600 seconds 1 day = 86400 seconds 1 week = 604800 seconds 1 month (30.44 days) = 2629743 seconds 1 year (365.24 days) = 31556926 seconds Here is a compute expression transformation in a data flow which is of type number.: daysBetween( toDate('hdr2OLI.user2Oppty.CreatedDate_sec_epoch'),toDate(( ( string_to_number( substr("09/01/2020",1,2)) - 1 ) * 2629742 ) + ( ( string_to_number(substr("09/01/2020",4,2)) - 1) * 86400 ) + ( (string_to_number(substr("09/01/2020",7,4) )-1970) * 31556926) ) )
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