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Anh Tuan Duong
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How to detect whether a user has selected a time when 00:00 is treated as NullTime?
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Hi everyone,

I’m facing an issue with a Time Input (24-hour format) in OutSystems in both Mobile and Webapp and would appreciate your help.

Problem description

  • The input type is Time

  • The field is marked as Required

  • When the user selects 00:00, OutSystems internally treats this value as NullTime()

  • Because of that, it’s impossible to distinguish between:

    • ❌ The user did not select any time

    • ✅ The user selected 00:00

I’m currently using manual validation to display the “This field is required” message.

Question

👉 Is there a way to reliably detect whether the user has actually selected a time, even when the selected value is 00:00?

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21 Dec 2025
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2026-06-20 17-43-43
Sherif El-Habibi
Champion

Hello,

Have you tried using the Time Picker block from OutSystems UI? It can achieve the desired approach and offers flexibility in choosing between 24-hour and 12-hour formats. It also includes built-in validation, so for example, selecting 00:00 in the 24-hour format does not trigger the same validation issues you might encounter with a standard input. 

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21 Dec 2025
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2024-10-05 13-30-20
Huy Hoang The

Hi Tuan Duong,

Because Default Value of Type Time is "00:00:00" so if u chose 00:00, so the system will treat it as null. 

I recommend u use Time Picker Component to config setting for Time Input and handle change events.

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22 Dec 2025
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2021-09-06 15-09-53
Dorine Boudry
 
MVP
  • using a Time Picker component will not magically make the system distinguish between 00:00 and not chosen. After user left the widget and/or screen, both will be treated the same.
  • There is no need for the Time Picker widget to be able to get a mandatory validation triggered, that works both on an input and the time picker widget, just set it as mandatory and make built-in validations run.
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22 Dec 2025
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2024-10-05 13-30-20
Huy Hoang The

 Replying to Dorine Boudry's comment on 22 Dec 2025 08:03:09

Thank Dorine, I know this, Time Picker will not distinguish between default values or user selects. We need to create a flag (TimeIsChanged) to indicate that it has been selected.


I'm only recommending Time Picker because it has many preset settings for time types. 

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23 Dec 2025
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2023-06-13 12-29-43
Sakthivel P

Hi @Tuan Duong,

As mentioned by community members, it is necessary to implement a custom validation similar to the OnChange or OnSelected actions of the TimePicker widget. This can be achieved by creating a flag variable, such as HasSelectedTime, which can be set to true within the respective action.

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22 Dec 2025
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