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let
    // Function to safely handle a date or return null if there's an error or invalid data
    ValidateDate = (dateValue) =>
        let
            result = try if dateValue is date then dateValue else null otherwise null
        in
            result,

    // Function to determine the sailing status based on ATD, ETD, and Carrier_ETD
    DetermineSailingStatus = (atd as nullable date, etd as nullable date, carrier_etd as nullable date) as text =>
        if ValidateDate(atd) <> null then
            "Sailed"
        else
            let
                validETD = ValidateDate(etd),
                validCarrierETD = ValidateDate(carrier_etd),
                duration = if validETD <> null and validCarrierETD <> null then Duration.Days(validCarrierETD - validETD) else null,
                result = if duration = null then 
                            "No data"
                         else if duration > 0 then 
                            "Delayed by " & Number.ToText(duration) & " days"
                         else if duration < 0 then 
                            "Sailing earlier by " & Number.ToText(-duration) & " days"
                         else 
                            "On Schedule"
            in
                result
in
    DetermineSailingStatus([ATD], [ETD], [Carrier ETD])
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