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gnucash/libgnucash
Christopher Lam ab641b31f8 [gnc-datetime] improve CSV date parser with ICU and boost
1. Add dateformat "Locale" with ICU; uses current locale for date
   parsing. ICU's locale date parser may parse "3 May 2023" or
   "2024年9月13日" (LC_TIME=zh_TW.utf8) and maybe others.

2. Augment d-m-y m-d-y and y-m-d with boost UK/US/ISO parsers. This allows
   CSV import of dates with months as words as "30 Sep 2023" or
   "May 4, 1978" or "2023-Dec-25". Note boost parser cannot recognise
   2-digit years, therefore "30 Sep 24" is invalid.
2024-09-14 10:13:52 +08:00
..
2023-03-10 12:51:30 -08:00