=DATE("20" & LEFT(MID(CELL("filename", A1), FIND("]", CELL("filename", A1)) + 1, 255), 2), MID(MID(CELL("filename", A1), FIND("]", CELL("filename", A1)) + 1, 255), 4, 2), RIGHT(MID(CELL("filename", A1), FIND("]", CELL("filename", A1)) + 1, 255), 2))
=DATE("20" & LEFT(MID(CELL("filename", A1), FIND("]", CELL("filename", A1)) + 1, 255), 2), MID(MID(CELL("filename", A1), FIND("]", CELL("filename", A1)) + 1, 255), 4, 2), RIGHT(MID(CELL("filename", A1), FIND("]", CELL("filename", A1)) + 1, 255), 2))
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