Power BI compare dates - powerbi

Question

I am new with power BI and need your help.
I have 3 columns which are:
date1
reviseDate
Shipped_Date
I need to compare column reviseDate to shipped_date if it is <> or =.
How to I do it, if reviseDate column is blank, must refer on column Date1 to compare with shipped_Date column?

Answer 1

Try this as a calculated column:
Status =
VAR DueDate =
IF(ISBLANK(Table1[Revised]), [Date1], [Revised])
RETURN
SWITCH(
TRUE(),
ISBLANK(DueDate), BLANK(),
DueDate = Table1[Shipped_Date], "On Time",
DueDate < Table1[Shipped_Date], "Late",
DueDate > Table1[Shipped_Date], "Early"
)
This defines the date you want to compare as a variable that we use to check different conditions.
The SWITCH(TRUE(),...) is a useful construction that returns the specified result for the first condition in the list that evaluates to TRUE().

Answer 2

You can define a new calculated column like this:
Status = IF (AND(ISBLANK(Table1[Date1]); ISBLANK(Table1[ReviseDate])); BLANK();
IF (Table1[Shipped_Date] = IF(ISBLANK(Table1[ReviseDate]); Table1[Date1]; Table1[ReviseDate]); "On Time";
IF (Table1[Shipped_Date] > IF(ISBLANK(Table1[ReviseDate]); Table1[Date1]; Table1[ReviseDate]); "Late";
IF (Table1[Shipped_Date] < IF(ISBLANK(Table1[ReviseDate]); Table1[Date1]; Table1[ReviseDate]); "Early"; BLANK())
)
)
)
The expression IF(ISBLANK(Table1[ReviseDate]); Table1[Date1]; Table1[ReviseDate]) will return Date1 value in case ReviseDate is empty. Then it is matter of comparing this reference date with Shipped_Date and returning appropriate status.
If you want to make status column using Power Query Editor, you can use Add Column -> Conditional Column. Make one helper column, named ReferenceDate or something, which will compute the date we need to use for comparison:
Then add the actual Status column like this:
The M code will look like this (the data is embedded in it):
let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("bY7RCQAhDEN36bcUUxTrLOL+aygenCkI/WjymtAxxKp2tQyXJHuunGnDFmFj+HldAQqUGzC89nPlsdYZuiITrL98PRRqQUkYCyqZCw==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Date1 = _t, ReviseDate = _t, Shipped_Date = _t]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Date1", type date}, {"ReviseDate", type date}, {"Shipped_Date", type date}}),
#"Added Conditional Column" = Table.AddColumn(#"Changed Type", "ReferenceDate", each if [ReviseDate] = null then [Date1] else [ReviseDate]),
#"Added Conditional Column1" = Table.AddColumn(#"Added Conditional Column", "Status", each if [ReferenceDate] = null then "" else if [ReferenceDate] = [Shipped_Date] then "On Time" else if [ReferenceDate] < [Shipped_Date] then "Late" else if [ReferenceDate] > [Shipped_Date] then "Early" else null),
Status = #"Added Conditional Column1"{2}[Status]
in
Status
Depending on your data source, you can even modify the query and retrieve this value from the database (e.g. with Transact-SQL query if your data source is SQL Server).