PeriodO date parser

Natural language date parsing for historical time periods.

Supported year formats

• Before Present

  Example: 2000BP

• ISO8601

  Example: 5000

• Gregorian

  Example: 1917AD, 1200BCE

• Approximate dates

  Example: 1200B.C., ca. 1923

• Date ranges

  Example: 21st century, early 14th century, 1200/1400

Example

const parser = require('periodo-date-parser')

// throws parser.SyntaxError if unsuccessful
console.log(parser.parse('200 AD'));
// { _type: 'gregorian', in: { year: '0200' }, label: '200 AD' }

console.log(parser.parse('middle of the 21st century'));
// { _type: 'gregorian',
//   in: { earliestYear: '2034', latestYear: '2067' },
//   label: 'middle of the 21st century' }