This could be due to our ageing matrix install (3.12.2), or maybe something I've screwed up, but I've built a custom form which uses a 'Datetime' input field. Part of the config for this field allows me to use the php date format to decide how I want my date to appear in the output. So far so good, but in reality this is what happens:
I choose [17][Sep][2008] from the automatically generated drop down fields, and I've formatted my output as 'l J F', which should give me "Wednesday 17 September". Instead it screws up and gives me "Sunday 17 September". Now the date object has enough information to do this right, why isn't it working?