With the Rest Toolkit, creating or updating an optional date field with an empty string results in an Invalid date error. Using null instead results in another error: Argument 1 cannot be null.

How can you make the field null?

client.update('Transaction__c', 'a0Ni0000000H1kWCHA', {Name: "1078", Date__c: "2013-03-14", Due_Date__c: ""}, function(){})
  • 1
    Can you not just use the value null?
    – Matt Lacey
    May 21, 2013 at 4:24
  • Could you please share some of your code?
    – doga
    May 21, 2013 at 10:19
  • @LaceySnr: I've tried null to no avail.
    – geeljire
    May 21, 2013 at 13:54
  • Sorry, that looks like my bug. You'll see that other types convert an empty string to null: bit.ly/10W3MIE If you fix it before I get a chance, please open a pull request.
    – xn.
    May 23, 2013 at 18:47
  • Fixed and working. Thanks for the tip: bit.ly/170bhFK
    – geeljire
    May 27, 2013 at 16:47

2 Answers 2


It sounds like this could be a limitation of the toolkit. If the remoting is being done in a VF page you could instead call a method your own apex method which could look for a specific date such as 01-01-1900 and set it to null when needed.

If you're outside of the platform (sounds like you might be) and really need this functionality then you could use a similar approach, set a specific date that wouldn't be used otherwise (01/01/1900) and then use a trigger to set that field to null.


Convert the empty string to null in RemoteTKController.cls by changing

obj.put(key, Date.valueOf(svalue));


obj.put(key, svalue == '' ? null : Date.valueOf(svalue));

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