More proof the issue is with the older date, if I use --dry-run it works:
C:\Python27>python C:\Inetpub\piwik\misc\log-analytics\import_logs.py --url=http://piwik/ D:\IISLOGS\GEMINI\W3SVC1908953133\ex121101.log --i
dsite=1 --recorders=4 --enable-http-errors --enable-http-redirects --enable-static --dry-run
0 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
Parsing log D:\IISLOGS\GEMINI\W3SVC1908953133\ex121101.log…
4275 lines parsed, 4000 lines recorded, 4000 records/sec (avg), 4000 records/sec (current)
8734 lines parsed, 8000 lines recorded, 4000 records/sec (avg), 4000 records/sec (current)
13116 lines parsed, 12000 lines recorded, 4000 records/sec (avg), 4000 records/sec (current)
17372 lines parsed, 16000 lines recorded, 4000 records/sec (avg), 4000 records/sec (current)
21444 lines parsed, 20117 lines recorded, 4023 records/sec (avg), 4117 records/sec (current)
25578 lines parsed, 24800 lines recorded, 4133 records/sec (avg), 4683 records/sec (current)
29716 lines parsed, 28800 lines recorded, 4114 records/sec (avg), 4000 records/sec (current)
33958 lines parsed, 32800 lines recorded, 4100 records/sec (avg), 4000 records/sec (current)
38288 lines parsed, 36800 lines recorded, 4088 records/sec (avg), 4000 records/sec (current)
42432 lines parsed, 40800 lines recorded, 4080 records/sec (avg), 4000 records/sec (current)
46507 lines parsed, 44966 lines recorded, 4087 records/sec (avg), 4166 records/sec (current)
…
236146 lines parsed, 232800 lines recorded, 4105 records/sec (avg), 4000 records/sec (current)
240329 lines parsed, 237600 lines recorded, 4117 records/sec (avg), 4800 records/sec (current)
244506 lines parsed, 241600 lines recorded, 4115 records/sec (avg), 4000 records/sec (current)
Logs import summary
243373 requests imported successfully
999 requests were downloads
2712 requests ignored:
17 invalid log lines
2695 requests done by bots, search engines, ...
0 HTTP errors
0 HTTP redirects
0 requests to static resources (css, js, ...)
0 requests did not match any known site
0 requests did not match any requested hostname
Website import summary
243373 requests imported to 1 sites
1 sites already existed
0 sites were created:
0 distinct hostnames did not match any existing site:
Performance summary
Total time: 59 seconds
Requests imported per second: 4119.52 requests per second
C:\Python27>