Crossing years affects the hours considered in graph

[DannyvdSluijs]

See attached, I've reported 36h last week but the graph only shows a total of 24h. Probably due to the fact that Monday and Tuesday are in the past year.

[DannyvdSluijs]

This seems to be related to the week number and week year used here which has complexity regarding year ending.

Probably the best way would be to use ISO week number and ISO year.