I'd like to bump this up as I have had a similar issue, but doesn't warrant a new thread.
When importing dates into Anaplan (without the time dimension), it has defaulted to the US format of mm/dd/yy. The bizarre thing is that the month before (around 1 June), it imported fine so is likely a result of a recent update you have rolled since then.
My work around to this was by converting the dates in excel to the US format, but is not an ideal solution to have to do each month, especially considering it was working fine until now. I have checked my browser settings and my language is set to English UK, so doesn't look like it's an issue at this end.
Can you advise if anything was changed in a recent release that would be causing the issue and if you're looking at a way of setting a default format?
Thanks.