> For the complete documentation index, see [llms.txt](https://docs.cascade.io/cascade/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cascade.io/cascade/functions-and-expressions/functions/date-time/isdate.md).

# ISDATE

ISDATE(`date`)

Returns true if an input is a valid date, returns false otherwise.

### Arguments

| Argument | Description        |
| -------- | ------------------ |
| `date`   | Date/time value(s) |

### Output

True if input is valid date, false otherwise

### Example

{% embed url="<https://datawrapper.dwcdn.net/Af42y/1>" %}