Some of the time formats in account settings seem wrong.
"y-m-d h:i:s a" gives me a 24 hour clock + am/pm.
"y-m-d H:i:s" gives a 12 hour clock without am/pm.
I am using Firefox 38.0 in Linux, but I don't think that's the problem?
Thanks for adding y-m-d formats by the way.