Nocc:C780de0d3ac3c245b859f5a2b8e4782ec30f8e3d-Y-m-d/qqq

This is likely a pattern describing the date format used to substitute parameter %2$s in message.

You apparently can use these codes: There are likely more placeholders available.
 * d = ordinal number of day within its month
 * m = ordinal number of month within its year
 * Y = Gregorian year
 * interpunctuation and spaces are taken verbatim