Converting Numerical Date back to Date Format

Lean

Hello community! Sorry for bothering with my Newbie-Question!

My problem:

I have missing values for a certain date attribute -Date1- that I want to fill up. It's actually quite easy, because I have two other attributes that will help me calculate the missing values. So there's a numeric attribute like -DaysUntil- and the other Date -Date2-. I have Date2 and -DaysUntil-, so 

Date2 - DaysUntil 

would give me my Date1 that I need.

As I said, -DaysUntil- is numeric, like 10 for example, and Date2 a date value. I can't calculate with those formats, so I already used the Date to Numeric Operator to get a numeric value for my Date2. I used day in the epoch. So now what I can do is to just substract the numeric values like given above, but that leaves me with a numeric value (day in epoch) for my Date1. (I need Date1 as a Date format though)

The Numeric to Date Operator doesn't work for this kind of 'back conversion'.

So how do I get my Date1 as a Date format value now?

Or should I use a different Operator for calculation in the first place?

Thank you so much for your answers!

rjones13

Hi,

You should be able to use a single operator to solve this problem. I used generate attributes with the following formula: if(missing([Date1]), date_add([Date2],-[DaysUntil],DATE_UNIT_DAY,"UTC"), [Date1])

I've also attached an example process. Any questions, please let me know.

Best,
Roland

<?xml version="1.0" encoding="UTF-8"?><process version="10.3.000">

  <context>

    <input/>

    <output/>

    <macros/>

  </context>

  <operator activated="true" class="process" compatibility="10.3.000" expanded="true" name="Process">

    <parameter key="logverbosity" value="init"/>

    <parameter key="random_seed" value="2001"/>

    <parameter key="send_mail" value="never"/>

    <parameter key="notification_email" value=""/>

    <parameter key="process_duration_for_mail" value="30"/>

    <parameter key="encoding" value="UTF-8"/>

    <process expanded="true">

      <operator activated="true" class="subprocess" compatibility="10.3.000" expanded="true" height="82" name="Generate demo data" width="90" x="45" y="34">

        <process expanded="true">

          <operator activated="true" class="utility:create_exampleset" compatibility="10.3.000" expanded="true" height="68" name="Create ExampleSet" width="90" x="45" y="34">

            <parameter key="generator_type" value="comma separated text"/>

            <parameter key="number_of_examples" value="3"/>

            <parameter key="use_stepsize" value="false"/>

            <list key="function_descriptions"/>

            <parameter key="add_id_attribute" value="false"/>

            <list key="numeric_series_configuration"/>

            <list key="date_series_configuration"/>

            <list key="date_series_configuration (interval)"/>

            <parameter key="date_format" value="yyyy-MM-dd HH:mm:ss"/>

            <parameter key="time_zone" value="SYSTEM"/>

            <parameter key="input_csv_text" value="Date1,DaysUntil,Date2&#10;1/1/23, 10, 11/1/23&#10;2/1/23, 10, 12/1/23&#10;3/1/23, 10, 13/1/23"/>

            <parameter key="column_separator" value=","/>

            <parameter key="parse_all_as_nominal" value="false"/>

            <parameter key="decimal_point_character" value="."/>

            <parameter key="trim_attribute_names" value="true"/>

          </operator>

          <operator activated="true" class="nominal_to_date" compatibility="10.3.000" expanded="true" height="82" name="Nominal to Date" width="90" x="179" y="34">

            <parameter key="attribute_name" value="Date1"/>

            <parameter key="date_type" value="date"/>

            <parameter key="date_format" value="DD/MM/yy"/>

            <parameter key="time_zone" value="SYSTEM"/>

            <parameter key="locale" value="English (United States)"/>

            <parameter key="keep_old_attribute" value="false"/>

          </operator>

          <operator activated="true" class="nominal_to_date" compatibility="10.3.000" expanded="true" height="82" name="Nominal to Date (2)" width="90" x="313" y="34">

            <parameter key="attribute_name" value="Date2"/>

            <parameter key="date_type" value="date"/>

            <parameter key="date_format" value="DD/MM/yy"/>

            <parameter key="time_zone" value="SYSTEM"/>

            <parameter key="locale" value="English (United States)"/>

            <parameter key="keep_old_attribute" value="false"/>

          </operator>

          <operator activated="true" class="blending:generate_columns" compatibility="10.3.000" expanded="true" height="82" name="Generate Attributes" width="90" x="447" y="34">

            <list key="function_descriptions">

              <parameter key="Date1" value="if(row_number()==2, MISSING_DATE_TIME, [Date1])"/>

            </list>

            <parameter key="keep_all_columns" value="true"/>

          </operator>

          <connect from_op="Create ExampleSet" from_port="output" to_op="Nominal to Date" to_port="example set input"/>

          <connect from_op="Nominal to Date" from_port="example set output" to_op="Nominal to Date (2)" to_port="example set input"/>

          <connect from_op="Nominal to Date (2)" from_port="example set output" to_op="Generate Attributes" to_port="table input"/>

          <connect from_op="Generate Attributes" from_port="table output" to_port="out 1"/>

          <portSpacing port="source_in 1" spacing="0"/>

          <portSpacing port="sink_out 1" spacing="0"/>

          <portSpacing port="sink_out 2" spacing="0"/>

        </process>

      </operator>

      <operator activated="true" class="blending:generate_columns" compatibility="10.3.000" expanded="true" height="82" name="Generate Attributes (2)" width="90" x="179" y="34">

        <list key="function_descriptions">

          <parameter key="Date1" value="if(missing([Date1]), date_add([Date2],-[DaysUntil],DATE_UNIT_DAY,&quot;UTC&quot;), [Date1])"/>

        </list>

        <parameter key="keep_all_columns" value="true"/>

      </operator>

      <connect from_op="Generate demo data" from_port="out 1" to_op="Generate Attributes (2)" to_port="table input"/>

      <connect from_op="Generate Attributes (2)" from_port="table output" to_port="result 1"/>

      <portSpacing port="source_input 1" spacing="0"/>

      <portSpacing port="sink_result 1" spacing="0"/>

      <portSpacing port="sink_result 2" spacing="0"/>

    </process>

  </operator>

</process>