Just posting back to report that we hadn't noticed any issue on Monday as our own phones - Yealink T54W - on a hosted 3CX were and are OK! A customer alerted us this morning.
The difference is that we have upgraded to V20 but have yet to undertake the upgrade for any of our customers. Has the issue been fixed with V20? Phones are showing Last Sunday in March correctly.
Hi guys, just in case you have not seen another post, we did receive an update from the Yealink team and were informed that the issue will be corrected in their next firmware update.