Aug 20, 2012 at 2:46 PM
Edited Aug 20, 2012 at 2:50 PM
Thanks for your replies.
Mark - yes, I realize that SPServices is simply returning the value from the webservice - but I thought this would be the best place for the discussion.
The timezone in the regional settings on all servers I tested this on was BST. I also tested this on my clients dev server - again seems to be BST - and had the same issue.
I tracked this down to a problem in rounding the date. You see the date value in the column was provided by a date control, with "00:00:00" concatenated onto the ending in JS, as the updatelistitems service appeared to require a time
portion to the date stamp.
Now the GetVersionCollection service was rounding this time differently, depending on whether the date was in the past, or the future. A stored value of :
01/01/2012 00:00:00 (in the past) would be returned by the getversioncollection as 01/01/2012
A stored value of 18/10/2012 00:00:00 (in the future) would be returned as 19/10/2012 - one extra day in the future.
To fix this, I simply concatinate a less dubious timestamp onto the value I send to updatelistitems: 18/10/2012 05:00:00.
This avoids the rounding issue, and my problem - but doesn't really explain the bug in the webservice.