POST Request date format

[tanasi]

Hi, 

I am using PS 1.6 and trying to create a cart rule through a POST request (web services). The issue I am facing is that I cannot identify the correct date format. So, for cart rules the 

date_from

data_to 

are mandatory. I have tried to put e.g.

2014-09-27T18:30:49.511Z

2011-07-14T19:43:37+0100

but it doesn't work. Can somebody point me to the correct format?

 

Thanks