Refactor of #170 in 120df19

src/_lib/newDateUTC/index.js

@@ -0,0 +1,11 @@
+/**
+ * Use instead of `new Date(Date.UTC(...))` to support years below 100 which doesn't work
+ * otherwise due to the nature of the
+ * [`Date` constructor](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#interpretation_of_two-digit_years.
+ */
+export default function newDateUTC(fullYear, month, day, hour, minute, second, millisecond) {
+  var utcDate = new Date(0)
+  utcDate.setUTCFullYear(fullYear, month, day)
+  utcDate.setUTCHours(hour, minute, second, millisecond)
+  return utcDate
+}

src/_lib/tzParseTimezone/index.js

@@ -1,4 +1,5 @@
 import tzTokenizeDate from '../tzTokenizeDate/index.js'
+import newDateUTC from '../newDateUTC/index.js'
 
 var MILLISECONDS_IN_HOUR = 3600000
 var MILLISECONDS_IN_MINUTE = 60000
@@ -70,7 +71,7 @@ export default function tzParseTimezone(timezoneString, date, isUtcDate) {
 }
 
 function toUtcDate(date) {
-  return newDateDateUTC(
+  return newDateUTC(
     date.getFullYear(),
     date.getMonth(),
     date.getDate(),
@@ -81,21 +82,19 @@ function toUtcDate(date) {
   )
 }
 
-function newDateDateUTC(fullYear, month, day, hour, minute, second, millisecond) {
-  var utcDate = new Date(0)
-  utcDate.setUTCFullYear(fullYear, month, day)
-  utcDate.setUTCHours(hour, minute, second, millisecond)
-  return utcDate
-}
-
-function DateUTC(fullYear, month, day, hour, minute, second, millisecond) {
-  return newDateDateUTC(fullYear, month, day, hour, minute, second, millisecond).getTime()
-}
-
 function calcOffset(date, timezoneString) {
   var tokens = tzTokenizeDate(date, timezoneString)
 
-  var asUTC = DateUTC(tokens[0], tokens[1] - 1, tokens[2], tokens[3] % 24, tokens[4], tokens[5], 0)
+  // ms dropped because it's not provided by tzTokenizeDate
+  var asUTC = newDateUTC(
+    tokens[0],
+    tokens[1] - 1,
+    tokens[2],
+    tokens[3] % 24,
+    tokens[4],
+    tokens[5],
+    0
+  ).getTime()
 
   var asTS = date.getTime()
   var over = asTS % 1000

src/zonedTimeToUtc/index.js

@@ -2,6 +2,7 @@ import cloneObject from 'date-fns/_lib/cloneObject/index.js'
 import toDate from '../toDate/index.js'
 import tzPattern from '../_lib/tzPattern/index.js'
 import tzParseTimezone from '../_lib/tzParseTimezone/index.js'
+import newDateUTC from '../_lib/newDateUTC'
 
 /**
  * @name zonedTimeToUtc
@@ -36,11 +37,15 @@ export default function zonedTimeToUtc(date, timeZone, options) {
 
   var d = toDate(date, options)
 
-  var tmp = new Date(0)
-  tmp.setUTCFullYear(d.getFullYear(), d.getMonth(), d.getDate())
-  tmp.setUTCHours(d.getHours(), d.getMinutes(), d.getSeconds(), d.getMilliseconds())
-
-  var utc = tmp.getTime()
+  var utc = newDateUTC(
+    d.getFullYear(),
+    d.getMonth(),
+    d.getDate(),
+    d.getHours(),
+    d.getMinutes(),
+    d.getSeconds(),
+    d.getMilliseconds()
+  ).getTime()
 
   var offsetMilliseconds = tzParseTimezone(timeZone, new Date(utc))