> For the complete documentation index, see [llms.txt](https://docs.feathery.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.feathery.io/platform/build-forms/advanced-logic/examples/field-validation/date-and-time-validations.md).

# Date and Time Validations

## Overview

In these examples, the rules are comparing and validating date selector fields, both with and without the time component.  

These rules run on the submit event and general you will want to run validation logic on submit so that if the validation fails, the form will not submit.

## Comparing Dates

In this example, the logic ensures that the trip start date is on or after the current date and the end date is after the start.  The date selector fields are dates only (no time).

```
// Ensure trip start is today or later and trip end is after start

// get today's date
const today = new Date(new Date().toISOString().slice(0,10));

// make sure and trip-start-date is >= today
if (TripStartDate.value && TripEndDate.value) {
  const tripStartDate = new Date(TripStartDate.value);
  const tripEndDate = new Date(TripEndDate.value);
  
  if (tripStartDate.getTime() < today.getTime()) {
    // The date is earlier than today, so set a validation error on the trip-start-date field
    TripStartDate.setError('Start date must be on or after today');
  }
  if (tripEndDate.getTime() <= tripStartDate.getTime()) {
    // The end date is not after start, so set a validation error on the trip-end-date field
    TripEndDate.setError('End date must be on or after Start Date');
  }
}

```

## Comparing Dates with a Time part

In this example, the logic ensures that the help request **response** date and time is after the help request date and time.  The date selector fields are dates with a time part.

```
// Validate that the reponse time is after request time

// make sure the fields are filled before comparing
if (HelpRequestDateTime.value && HelpRequestResponseDateTime.value) {
  const requestTime = new Date(HelpRequestDateTime.value);
  const responseTime = new Date(HelpRequestResponseDateTime.value);
  
  if (responseTime.getTime() <= requestTime.getTime()) {
    // Response is not after request, so set a validation error on the help-request-response-date-time field
    HelpRequestResponseDateTime.setError('Response time must be after request time');
  }
}
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.feathery.io/platform/build-forms/advanced-logic/examples/field-validation/date-and-time-validations.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.