hi @RJ_Southam,

Your formula is correct as long as the field with the date of birth is called DOB.

I would possibly modify it to this: If(DOB<=12/31/2017, ,"") if you want to actually have a blank field when the condition does not hold instead of a field with a space.

Hope this helps!

Website: alessiomonino.com

Calendly: Calendly - Alessio Monino

Email: alessio.monino@gmail.com

Thanks Alessio, any other idea it still says invalid formula I tired =< and <= I also tried brackets around the date…

IF(

  DATESTR({DOB}) <= "2017-12-31",

  "star"

)

Actually the original formula had several issues.

• 
  

  Emoji are characters and need to be enclosed in straight quotes.

  
  


• 
  

  Hardcoded date strings need to be enclosed in straight quotes. As written 12/31/2017 is a mathematical expression that evaluates to about 0.000191917091816.

  
  


• 
  

  It is also better to compare text strings with text strings rather than hoping that Airtable will correctly do data type conversion.

  
  


• 
  

  it is better to completely omit the third parameter than to include a text string of one space or an empty text string.

  
  

IF(

  DATESTR({DOB}) <= "2017-12-31",

  "star"

)

Thank you that worked!

IF(

  DATESTR({DOB}) <= "2017-12-31",

  "star"

)

Would you help me with a second part I want to flag children that are turning 3 this year as of today.

IF(

DATESTR({DOB}) <= “2017-12-31”,

“ ”,IF(

DATESTR({DOB}) between today and “2019-12-31”,

)