there is a request for some functions not supported by the standard method:

• ISO 8601 compliant (at first only partially)
• incomplete dates (no year or no day) compliant
• generation of errors in case of incorrect input (with support for service categories)
• parsing incoming short text dates of different formats in different languages ✓ done for [ru; en; de; fr] / [yyy*mm*dd; dd*mm*yyy; mm*yyy; yyy*mm; d mmm yyy; mmm d, yyy; mmm yyy]
• handling negative dates (BC) without year zero (both input and output)
• date conversion to digital formats (JD, lua os.date Unix time) and other calendars (groundwork for the future)
• getting a formatting string (& some parameters?) and converting the date by it: ✓ done for standart lang:formatDate
  • optional automated wiki links to dates and years
  • optional hiding duplicate months and years (for templates for displaying Gregorian and Julian dates)

input

• Date text
• (optional) Format string - YYYY-MM-DD if not specified
• (optional) Parameter table

output

• Formatted date text
• Date table (with fields day/month/year/JD/etc)
• Status table (with fields indicating whether it was possible to extract a full or incomplete date and errorText и errorCat in case of errors)

implementing at Module:Calendar#BoxDate