Epiweek parser broken?

[ArtPoon]

> foo[foo$year==2019,]
     region country year week mut.type mut.pos mut.diff count
5676   Asia   China 2019    1        ~      15        A     1
5677   Asia   China 2019    1        ~   20581        A     1
5678   Asia   China 2019    1        ~   20590        A     1
5679   Asia   China 2019    1        ~   21048        G     1
5680   Asia   China 2019    1        ~   21227        A     1
5681   Asia   China 2019    1        ~   21567        A     1
5682   Asia   China 2019    1        ~      22        C     1
5683   Asia   China 2019    1        ~      23        G     1
5684   Asia   China 2019    1        ~   24236        G     3
5685   Asia   China 2019    1        ~      30        G     1
5686   Asia   China 2019    1        ~      31        C     1
5687   Asia   China 2019    1        ~      35        A     1
5688   Asia   China 2019    1        ~    6907        C     1
5689   Asia   China 2019    1        ~    6927        A     1
5690   Asia   China 2019    1        ~    7912        C     1
5691   Asia   China 2019    1        ~    9445        T     1
5692   Asia   China 2019   52        ~   11675        A     1
5693   Asia   China 2019   52        ~    3689        G     1
5694   Asia   China 2019   52        ~    6879        A     1
5695   Asia   China 2019   52        ~    8299        G     1
5696   Asia   China 2019   52        ~    8898        A     1

It shouldn't be possible that genomes were sampled in January 2019.

[ArtPoon]

The problem is probably here:

plodex/scripts/parse_fasta.py

Lines 294 to 297 in d2d0696

	coldate = parse_date(coldate)
	epiweek = Week.fromdate(coldate).week
	year = coldate.year
	yeek = '{}|{:02d}'.format(year, epiweek)

where collection dates that are very late in 2019 are rolled into Week 1 of 2020