Question Type: Time-Based Math (Date/Time)



Date/Time based math allows you to calculate a date based on a start date question, and a duration question. This can be useful when calculating estimated completion dates on projects.

It can be difficult to determine when to use Time-Based Math or Duration Math. Simply put, if you want to show a date (e.g. Feb 11, 2019), use Time-Based Math. If you want to show a duration (e.g. 8:30, meaning 8 hours and 30 minutes), use Duration Math

An example of a Time-Based Math (Date/Time) question on an iOS device is shown below:


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Form Builder

In the Form Builder, the Time-Based Math (Date/Time) question appears as shown below:

The Question Edit screen for the Time-Based Math (Date/Time) has three tabs: General, Properties, and Help Options. This article will go through each of the tabs.


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Unique ID 

The Unique ID is the reference for the question. For more information on Unique IDs, read: Overview: Unique IDs. It can either be auto-generated based on the question text, or customized.

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Restrictions control how your mobile users interact with a question. They can be set on the question itself, or controlled by Conditional Logic.

  Required Read-Only Hidden on Device Hidden in Reports
Time-Based Math (Date/Time) ✓ *

* Time-Based Math is Read-Only by default, as the mobile user cannot interact with them.

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Properties allow you to set up your question in various ways. Some Properties are due to the Data Type chosen for the question. The Time-Based Math (Date/Time) question type only allows one data type:

  • Range Validation


Calculate a Date/Time

This section allows you to set your source questions for the calculation, and what kind of calculation you are doing. For example, if calculating a projected end date for a construction project, you would want to select Add Duration.


Start Date/Time Question: This dropdown will allow you to select any questions using a Date/Time data type that come before the Time-Based Math question.

Operator: You can add or subtract the duration from the Start Date/Time question to get to your answer.

Duration Question: This dropdown will allow you to select any questions that use a Duration data type that come before the Time-Based Math question.

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Help Options

Adding "Help" content to forms gives mobile users access to support and other resources out in the field.  Help content is available to users through a button embedded beside a question.  Any question in the form can include a link to Youtube videos, web pages, or HTML-formatted work instructions. 

For more information on Help Content, please read: V2 Forms: Adding Help Content to Questions

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