Today I discovered that it seems the phone in my office(SPA504G) doesn't believe that the 30th of September exists. I noticed this morning that the date had not changed from the 29th even though the time was all correct. So then I thought i'd try to update it manually but it simply would not accept the 30 as part of the date. I could quite happily change it to the 1st of October and back to the 29th of September but not the 30th. I tried a full factory reset and also two different firmware versions but still no go.
My phone is just a stand alone unit that I use with an external VOIP provider and I am using the web interface to configure it. I also tried upating the date directly from the phone but that didn't help either. Has anyone seen this before?