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