Liquid Studio Documentation
Data Mapping / Data Mapper Functions / By Category / Date Time / Year
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    Function Name
    Retrieve the year portion of a DateTime value
    DateTime DateTime value to retrieve year from
    Year Year value from DateTime input
    None -


    The Data Mapper DateTime Year function returns the year portion of a DateTime value. Many applications use DateTime values to record information about events, for example retail or other account transactions. It is often necessary to retrieve particular portions of a DateTime value, such as the year, or to separate the DateTime into its component parts for the target application. To apply the DateTime Year function, use the following process:

    Create a new Data Mapper file, dragging your XML data source and targets into the editor area. For this example we are using sales_source.xsd, an XML Schema Definition inferred from the following source:

    Source XML
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    For our target schema we will be using sales_target.xsd, inferred from the following XML:

    Target XML
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     <sale id="8987612312" item="y6yt5i93e4">
     <sale id="2090176549" item="i8u7b45f7y">
     <sale id="2819283722" item="y6yt5i93e4">

    The data models retail transactions, including the DateTime for when a sale was made. Let's assume that in this case we only want to map the year during which each transaction took place, perhaps for marketing purposes. Here is the Data Mapper with Source and Target imported:

    Data Mapper Source and Target

    Drag the DateTime Year function from the Component Palette into the mapping area:

    Year Component

    Year Transform Added

    The Year function takes a single input, the DateTime in question, giving an output comprising the year portion. The input should be connected to the source item, which will normally be an item in the XML Reader. The output should be connected to the target item, whether an item in the XML Writer or another component in the Mapper, for example if you plan on using the Year value to sort or filter the data in terms of purchases made over a period of several years.

    Connect the Year function input to the "transaction" output in the XML Reader and the Year output to the "bought_time" input in the XML Writer.

    Year Mapped

    Now the only portion of the DateTime mapped will be the year value. If you want to map more than one part of a DateTime, you can use the other DateTime functions, connecting them each to your source DateTime input and mapping them forward as necessary.

    Finally, connect the remaining inputs and outputs:

    Input and Output Connections Mapped

    We can now execute the transform by pressing Shift-F5 or the Execute button (Execute). The transform is applied and the file we selected as output opens in the editor:

    Output XML
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     <sale id="9099879823" item="ab65gh7hh7">
     <sale id="2390865748" item="g7hy65tfd3">
     <sale id="8250987123" item="d4rf54r0op">

    The "bought_time" contains an indicator of the year during which each transaction was made, represented as a number.

    If you pass a value to the Year function that is not a DateTime, the Mapper will attempt to parse it. If you pass the Year function a DateTime value which does not contain a year portion, the function will output the current year by default.

    This is a scalar function so the standard rules apply if multiple values are presented to one or more inputs.

    See Also