Problem with Date/Time handling for some graphs

We updated to the latest version last week. After that, I noticed that some graphs say 1970-01-01 by default on the manual input of the date. In the past, the period that was currently displayed in the graph was always entered here. So it was easy to modify this a little bit.
 
After updating to the latest version today, this only seems to be the case for a few graphs. Maybe something has been changed in the meantime?
Currently, the problem still exists for a few graphs. For example, I still notice it with the Peering & Transit graphs, which I reach by clicking on the corresponding graph on the start page. The URL is then, for example, as follows: http://x.x.x.x/graphs/type=global_bits/port_type=peering/separate=yes/draw_all=yes/legend=no/class=image-refresh/