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Assume that we have a project with the following data.

Based on this data, the table below shows sample formulas, the output of that formula and also provides an explanation.

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Now, lets try creating some formula using custom dields fields and using some logic :

• Accessing a custom field of attached to Client of a Project on a Task Reportin a formula attached to Task.
  Let us say that you have a requirement to flag all tasks in a project where the custom field of client is rated as 1 as your 'High' priority tasks, 2 as 'Normal' tasks and 3 as 'Low' priority tasks. There is a custom field for Client which rates the client as 1 or 2 or 3 depending on the client's value to my your business. The custom field is called 'Rating' and has a formula key 'client_rate_01'. Now, you need to create a custom formula field on task. Let us name this 'Task Importance'. The formula will look like this :
  ${entityme.project.client.client_rate _01 == 1 ? (High) : ' ' || entityme.project.client.client_rate _01 == 2 ? (Normal): ' ' || entityme.project.client.client_rate _01 == 3 ? (Low) :' '} 
  
  Now if display 'Task Importance' column in a task report and you will know the importance of the task and can follow up accordingly.

• Date Arithmetic
  Let us assume that one of the projects where you are a PM has completed. Now, you want to compare which of your resources, took more days to complete

  the task due to which the project's deadline was not met.

  their task.
  For this, you need the Finish(Actual) date (

  Finish) date of

  me.actualFinishCalendar) of the task and the

  deadline

  planned finish date of the

  project. Then, subtract these values and you will get the results.

  task (me.finishCalendar).
  Since, these two fields are

  dates

  of type date, you cannot perform

  direct

  a direct operation on them.  You need to

  first

  convert them to a number and then perform the

  operations. Create a formula field for task and get the variable for the two fields i.e  Actual (Finish) (entity.actualFinish) date of the task and Project's deadline (entity.project.deadlineCalendar). Then

  operation. So, the formula will look like:
  ${(

  entity

  me.

  project.deadlineCalendar

  finishCalendar.time.time -

  entity

  me.

  actualFinish

  actualFinishCalendar.time.time)/86400000}
  
  When you write ".time.time" it means that the date field is first converted to milliseconds for both the fields, then the subtraction is done. The result is again in milliseconds which needs to be converted again in days and hence, it is divided by 86400000.

  This gives

  The result is the extra or less days taken by the resources to complete the task

  due to which the deadline was affected.
  

  Define your own health indicators
  Your company may have a different logic on how a budget/schedule status for your task/project is calculated and so you do not wish to use the one provided by us. Lets take an example that you actually want the schedule status to show the status depending on the baseline dates; instead of the projected dates. Then,
    a) You need to create a formula field which will have the below formula
    b) The Output type of the custom field will be Text. 
    c) Attach the custom field to 'Task' or the entity for which you want to create the custom field.
    d) The field references like entity.projectedFinishCalendar.time.time, entity.baselineFinish.time, etc can be taken from the Field References tab.

  Code Block${set ("label", 'Unknown')} ${set ("label", entity.projectedFinishCalendar.time.time <= entity.baselineFinish.time && entity.percentComplete!=100 ? 'On Time' : label)} ${set ("label", entity.percentComplete!=100 && Date.now().time > entity.baselineFinish.time ? 'Overdue' : label)} ${set ("label", entity.projectedFinishCalendar.time.time > entity.baselineFinish.time && Date.now().time < entity.baselineFinish.time ? 'At Risk' : label)} ${set ("color", 'Neutral')} ${ set ("color", label eq 'On Time' ? '#008000' : color)} ${ set ("color", label eq 'At Risk' ? '#FFA500' : color)} ${ set ("color", label eq 'Overdue' ? '#FF0000' : color)} <span style="display:inline-block;width:10px;height:10px;background-color:${color} ;border-radius:5px;"></span>&#160;${label}

  . The PM can pick this custom field as a column in a task report to see the difference.