117 lines
2.6 KiB
JavaScript
117 lines
2.6 KiB
JavaScript
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'use strict'
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var DATE_TIME = /(\d{1,})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2})(\.\d{1,})?.*?( BC)?$/
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var DATE = /^(\d{1,})-(\d{2})-(\d{2})( BC)?$/
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var TIME_ZONE = /([Z+-])(\d{2})?:?(\d{2})?:?(\d{2})?/
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var INFINITY = /^-?infinity$/
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module.exports = function parseDate (isoDate) {
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if (INFINITY.test(isoDate)) {
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// Capitalize to Infinity before passing to Number
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return Number(isoDate.replace('i', 'I'))
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}
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var matches = DATE_TIME.exec(isoDate)
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if (!matches) {
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// Force YYYY-MM-DD dates to be parsed as local time
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return getDate(isoDate) || null
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}
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var isBC = !!matches[8]
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var year = parseInt(matches[1], 10)
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if (isBC) {
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year = bcYearToNegativeYear(year)
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}
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var month = parseInt(matches[2], 10) - 1
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var day = matches[3]
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var hour = parseInt(matches[4], 10)
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var minute = parseInt(matches[5], 10)
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var second = parseInt(matches[6], 10)
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var ms = matches[7]
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ms = ms ? 1000 * parseFloat(ms) : 0
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var date
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var offset = timeZoneOffset(isoDate)
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if (offset != null) {
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date = new Date(Date.UTC(year, month, day, hour, minute, second, ms))
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// Account for years from 0 to 99 being interpreted as 1900-1999
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// by Date.UTC / the multi-argument form of the Date constructor
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if (is0To99(year)) {
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date.setUTCFullYear(year)
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}
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if (offset !== 0) {
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date.setTime(date.getTime() - offset)
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}
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} else {
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date = new Date(year, month, day, hour, minute, second, ms)
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if (is0To99(year)) {
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date.setFullYear(year)
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}
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}
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return date
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}
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function getDate (isoDate) {
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var matches = DATE.exec(isoDate)
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if (!matches) {
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return
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}
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var year = parseInt(matches[1], 10)
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var isBC = !!matches[4]
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if (isBC) {
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year = bcYearToNegativeYear(year)
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}
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var month = parseInt(matches[2], 10) - 1
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var day = matches[3]
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// YYYY-MM-DD will be parsed as local time
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var date = new Date(year, month, day)
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if (is0To99(year)) {
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date.setFullYear(year)
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}
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return date
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}
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// match timezones:
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// Z (UTC)
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// -05
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// +06:30
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function timeZoneOffset (isoDate) {
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if (isoDate.endsWith('+00')) {
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return 0
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}
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var zone = TIME_ZONE.exec(isoDate.split(' ')[1])
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if (!zone) return
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var type = zone[1]
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if (type === 'Z') {
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return 0
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}
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var sign = type === '-' ? -1 : 1
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var offset = parseInt(zone[2], 10) * 3600 +
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parseInt(zone[3] || 0, 10) * 60 +
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parseInt(zone[4] || 0, 10)
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return offset * sign * 1000
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}
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function bcYearToNegativeYear (year) {
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// Account for numerical difference between representations of BC years
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// See: https://github.com/bendrucker/postgres-date/issues/5
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return -(year - 1)
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}
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function is0To99 (num) {
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return num >= 0 && num < 100
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}
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