refactor: Replace moment-timezone with luxon

package.json

@@ -54,7 +54,7 @@
     "colors": true
   },
   "dependencies": {
-    "moment-timezone": "^0.5.34"
+    "luxon": "^3.0.1"
   },
   "devDependencies": {
     "c8": "^7.11.3",

src/CalDate.js

@@ -1,5 +1,4 @@
-
-import moment from 'moment-timezone'
+import { DateTime } from 'luxon'
 import { toYear, toNumber, isDate, pad0 } from './utils.js'
 
 const PROPS = ['year', 'month', 'day', 'hour', 'minute', 'second']
@@ -182,7 +181,22 @@ export class CalDate {
    */
   toTimezone (timezone) {
     if (timezone) {
-      return new Date(moment.tz(this.toString(), timezone).format())
+      return DateTime.fromObject(
+        {
+          day: this.day,
+          month: this.month,
+          year: this.year,
+          hour: this.hour,
+          minute: this.minute,
+          second: this.second,
+          millisecond: 0
+        },
+        {
+          zone: timezone
+        }
+      )
+        .toUTC()
+        .toJSDate()
     } else {
       return this.toDate()
     }
@@ -196,13 +210,13 @@ export class CalDate {
    */
   fromTimezone (dateUTC, timezone) {
     if (timezone) {
-      const m = moment.tz(dateUTC, timezone)
-      this.year = m.year()
-      this.month = m.month() + 1
-      this.day = m.date()
-      this.hour = m.hours()
-      this.minute = m.minutes()
-      this.second = m.seconds()
+      const m = DateTime.fromJSDate(dateUTC, { zone: timezone })
+      this.year = m.year
+      this.month = m.month
+      this.day = m.day
+      this.hour = m.hour
+      this.minute = m.minute
+      this.second = m.second
     } else {
       this.set(dateUTC)
     }
@@ -215,8 +229,13 @@ export class CalDate {
    */
   toDate () {
     return new Date(
-      this.year, this.month - 1, this.day,
-      this.hour, this.minute, this.second, 0
+      this.year,
+      this.month - 1,
+      this.day,
+      this.hour,
+      this.minute,
+      this.second,
+      0
     )
   }
 

test/CalDate.mocha.js

@@ -96,6 +96,24 @@ describe('#CalDate', function () {
     assert.strictEqual(res, '2000-01-01T05:00:00.000Z')
   })
 
+  it('can move date by timezone Tokyo (march 2015)', function () {
+    const caldate = new CalDate(new Date('2015-03-21 00:00:00'))
+    const res = caldate.toTimezone('Asia/Tokyo').toISOString()
+    assert.strictEqual(res, '2015-03-20T15:00:00.000Z')
+  })
+
+  it('can move date by timezone Tokyo (sepetember 2015)', function () {
+    const caldate = new CalDate(new Date('2015-09-23 00:00:00'))
+    const res = caldate.toTimezone('Asia/Tokyo').toISOString()
+    assert.strictEqual(res, '2015-09-22T15:00:00.000Z')
+  })
+
+  it('can move date by timezone Tokyo (sepetember 2021)', function () {
+    const caldate = new CalDate(new Date('2021-09-23 00:00:00'))
+    const res = caldate.toTimezone('Asia/Tokyo').toISOString()
+    assert.strictEqual(res, '2021-09-22T15:00:00.000Z')
+  })
+
   it('can return date in current timezone', function () {
     const caldate = new CalDate({ year: 2000, month: 1, day: 1 })
     const exp = new Date('2000-01-01 00:00:00')