ISDATE
TheISDATE
formula in Google Sheets checks if the provided value is a valid date or not. It returns a boolean value of TRUE if the value is a valid date, and FALSE otherwise.
 How to use
ISDATE
formula?  Examples of using
ISDATE
formula ISDATE
formula not working? Similar formulas to
ISDATE
Usage
Use the ISDATE
formula with the syntax shown below, it has 1 required parameter:
 value (required):
The value that needs to be checked if it is a valid date or not.
Examples
Here are a few example use cases that explain how to use theISDATE
formula in Google Sheets.
Check if a value is a valid date
You can use the ISDATE
formula to quickly check if a value in a cell is a valid date or not. This is useful when you are working with large datasets and need to quickly identify invalid date values.
Conditional formatting for dates
You can use the ISDATE
formula in combination with conditional formatting to highlight cells that contain valid dates. This can help you quickly identify important dates, such as deadlines or milestones.
Filtering by dates
You can use the ISDATE
formula to filter data based on dates. For example, you can filter a list of transactions to only show those that occurred on a specific date or within a particular date range.
Common Mistakes
ISDATE
not working? Here are some common mistakes people make when using the ISDATE
Google Sheets Formula:
Incorrect argument type
ISDATE only accepts a single argument of any type. Passing multiple arguments or the wrong type of argument will result in an error.
Invalid date format
ISDATE considers a date to be any valid date format recognised by Google Sheets. If the input value is not recognised as a date, ISDATE will return FALSE.
Confusion with ISTEXT
ISDATE and ISTEXT can be easily confused. Remember that ISDATE checks if a value is a date, while ISTEXT checks if a value is text.
Time zone issues
ISDATE considers dates without a specified time zone to be in the sheet's time zone. If you need to compare dates across time zones, make sure to use the appropriate functions or adjust the time zone settings.
Missing value
If the input value is empty or refers to a cell that is blank, ISDATE will return FALSE.
Related Formulas
The following functions are similar to ISDATE
or are often used with it in a formula:

DATE
The
DATE
formula is used to create a date object in Google Sheets. It takes three arguments: year, month, and day and returns a date. This formula is useful when you need to perform date calculations or create datebased charts and graphs. 
DATEDIF
The
DATEDIF
function in Google Sheets calculates the difference between two dates using a specified unit of measurement. This function is commonly used to calculate the length of time between two dates, such as the number of days, months, or years. The function is particularly useful when working with financial or project planning data. 
YEAR
The YEAR formula in Google Sheets returns the year of a specified date. This function is useful when you need to extract the year from a date for analysis or calculations. The YEAR formula takes one argument, which is the date from which to extract the year. The output is a fourdigit number representing the year.

MONTH
The
MONTH
formula is used to extract the month from a given date, returning it as a number between 1 and 12. This function is commonly used to summarize and analyze data that includes dates. 
DAY
The
DAY
function is used to extract the day of the month from a given date. It takes in a single argument, a date in a valid format, and returns the day of the month as a number between 1 and 31. This function can be useful for tasks such as sorting or filtering data based on the day of the month.
Learn More
You can learn more about the ISDATE
Google Sheets function on Google Support.