Actually it is possible to backdate your news items to the value you have specified in your custom field using the GetValue() method. Please take a look at the sample code below which sets the PublicationDate and DateCreated for all news items to the date specified in the custom filed. It'd be best to make the custom field of a DateTime type, so that users can get the advantage of the DateTime picker and also ensure the specified date would be in the correct format.
var newsAll = App.WorkWith()
// .Where(nI => nI.Status == ContentLifecycleStatus.Live)
var val = nI.GetValue(
var ss = DateTime.Parse(val);
nI.PublicationDate = ss;
nI.DateCreated = ss;
I hope you find this information useful, if you need any further assistance please let us know.
the Telerik team
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