How to use __createdAt in a query

Hi
In Objective C, I'm trying to query a table and get all entities with __createdAt later than someDate. I tried the following code:
NSPredicate *predicate = [NSPredicate
predicateWithFormat:@"__createdAt > %@", somdeDate];
MSQuery *query = [aTable queryWithPredicate: predicate];
but I get a Bad request error. Interestingly there is no error when I use == instead of > in the predicate.
Could someone please help? Thanks!

What backend are you using?
For .NET, you need to have the query generate a datetimeoffset string in the oData it sends to the server. To do that you need to make your "someDate" variable be a MSDateOffset:
https://github.com/Azure/azure-mobile-services/blob/master/sdk/iOS/src/MSDateOffset.h

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