Invalid isoformat string: '7-Mai-2023'

[WolfgangFahl]

reading volumes for VolumeManager from cache /Users/wf/.ceurws/ceurws.db
Invalid isoformat string: '7-Mai-2023'
read 3673 volumes from VolumeManager in   0.1 s

i fear the single wrong isodate leads to not reading all volumes (should be 3698 ...)

[WolfgangFahl]

SELECT number,pubdate from volumes limit 5

also gives strange results

[number](http://127.0.0.1:8080/volumes/query/?sql=SELECT+number,pubdate+from+volumes+limit+5&ordering=1) 	[pubDate](http://127.0.0.1:8080/volumes/query/?sql=SELECT+number,pubdate+from+volumes+limit+5&ordering=2)
1 	797234400000000
2 	823071600000000
3 	827650800000000
4 	833954400000000
5 	843717600000000

[WolfgangFahl]

these are still followup issues of WolfgangFahl/pyLoDStorage#127

[WolfgangFahl]

I have fixed index.html to 7-May-2023 now but the timestamp issue remains

[WolfgangFahl]

see also https://submissions.ceur-ws.org/scp/tickets.php?id=1615