persian-new-year-dates.js

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// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally

// Copyright (C) 2026 Igalia, S.L. All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

esid: sec-temporal.plaindate.from

description: >

  The ISO date of Nowruz (1 Farvardin) for Persian years 1206–1498 AP matches

  the data published by the Iranian calendar authority

info: |

  The Iranian calendar authority has published the Gregorian date of 1 Farvardin

  for each Persian year from 1206 to 1498 AP.

  Source: https://calendar.ut.ac.ir/documents/2139738/7092644/Kabise+Shamsi+1206-1498.pdf

  Data: https://github.com/roozbehp/persiancalendar/blob/main/kabise.txt (CC0)

includes: [temporalHelpers.js]

features: [Temporal, Intl.Era-monthcode]

---*/

// [persianYear, isoDay] pairs from the Iranian calendar authority

// (Nowruz always falls in March; ISO year is persianYear + 621)

const nowruzDates = [

  [1206, 22],

  [1207, 21],

  [1208, 21],

  [1209, 21],

  [1210, 21],

  [1211, 21],

  [1212, 21],

  [1213, 21],

  [1214, 21],

  [1215, 21],

  [1216, 21],

  [1217, 21],

  [1218, 21],

  [1219, 21],

  [1220, 21],

  [1221, 21],

  [1222, 21],

  [1223, 21],

  [1224, 21],

  [1225, 21],

  [1226, 21],

  [1227, 21],

  [1228, 21],

  [1229, 21],

  [1230, 21],

  [1231, 21],

  [1232, 21],

  [1233, 21],

  [1234, 21],

  [1235, 21],

  [1236, 21],

  [1237, 21],

  [1238, 21],

  [1239, 21],

  [1240, 21],

  [1241, 21],

  [1242, 21],

  [1243, 20],

  [1244, 21],

  [1245, 21],

  [1246, 21],

  [1247, 20],

  [1248, 21],

  [1249, 21],

  [1250, 21],

  [1251, 20],

  [1252, 21],

  [1253, 21],

  [1254, 21],

  [1255, 20],

  [1256, 21],

  [1257, 21],

  [1258, 21],

  [1259, 20],

  [1260, 21],

  [1261, 21],

  [1262, 21],

  [1263, 20],

  [1264, 21],

  [1265, 21],

  [1266, 21],

  [1267, 20],

  [1268, 21],

  [1269, 21],

  [1270, 21],

  [1271, 20],

  [1272, 21],

  [1273, 21],

  [1274, 21],

  [1275, 20],

  [1276, 20],

  [1277, 21],

  [1278, 21],

  [1279, 21],

  [1280, 21],

  [1281, 22],

  [1282, 22],

  [1283, 21],

  [1284, 21],

  [1285, 22],

  [1286, 22],

  [1287, 21],

  [1288, 21],

  [1289, 22],

  [1290, 22],

  [1291, 21],

  [1292, 21],

  [1293, 22],

  [1294, 22],

  [1295, 21],

  [1296, 21],

  [1297, 22],

  [1298, 22],

  [1299, 21],

  [1300, 21],

  [1301, 22],

  [1302, 22],

  [1303, 21],

  [1304, 21],

  [1305, 22],

  [1306, 22],

  [1307, 21],

  [1308, 21],

  [1309, 21],

  [1310, 22],

  [1311, 21],

  [1312, 21],

  [1313, 21],

  [1314, 22],

  [1315, 21],

  [1316, 21],

  [1317, 21],

  [1318, 22],

  [1319, 21],

  [1320, 21],

  [1321, 21],

  [1322, 22],

  [1323, 21],

  [1324, 21],

  [1325, 21],

  [1326, 22],

  [1327, 21],

  [1328, 21],

  [1329, 21],

  [1330, 22],

  [1331, 21],

  [1332, 21],

  [1333, 21],

  [1334, 22],

  [1335, 21],

  [1336, 21],

  [1337, 21],

  [1338, 22],

  [1339, 21],

  [1340, 21],

  [1341, 21],

  [1342, 21],

  [1343, 21],

  [1344, 21],

  [1345, 21],

  [1346, 21],

  [1347, 21],

  [1348, 21],

  [1349, 21],

  [1350, 21],

  [1351, 21],

  [1352, 21],

  [1353, 21],

  [1354, 21],

  [1355, 21],

  [1356, 21],

  [1357, 21],

  [1358, 21],

  [1359, 21],

  [1360, 21],

  [1361, 21],

  [1362, 21],

  [1363, 21],

  [1364, 21],

  [1365, 21],

  [1366, 21],

  [1367, 21],

  [1368, 21],

  [1369, 21],

  [1370, 21],

  [1371, 21],

  [1372, 21],

  [1373, 21],

  [1374, 21],

  [1375, 20],

  [1376, 21],

  [1377, 21],

  [1378, 21],

  [1379, 20],

  [1380, 21],

  [1381, 21],

  [1382, 21],

  [1383, 20],

  [1384, 21],

  [1385, 21],

  [1386, 21],

  [1387, 20],

  [1388, 21],

  [1389, 21],

  [1390, 21],

  [1391, 20],

  [1392, 21],

  [1393, 21],

  [1394, 21],

  [1395, 20],

  [1396, 21],

  [1397, 21],

  [1398, 21],

  [1399, 20],

  [1400, 21],

  [1401, 21],

  [1402, 21],

  [1403, 20],

  [1404, 21],

  [1405, 21],

  [1406, 21],

  [1407, 20],

  [1408, 20],

  [1409, 21],

  [1410, 21],

  [1411, 20],

  [1412, 20],

  [1413, 21],

  [1414, 21],

  [1415, 20],

  [1416, 20],

  [1417, 21],

  [1418, 21],

  [1419, 20],

  [1420, 20],

  [1421, 21],

  [1422, 21],

  [1423, 20],

  [1424, 20],

  [1425, 21],

  [1426, 21],

  [1427, 20],

  [1428, 20],

  [1429, 21],

  [1430, 21],

  [1431, 20],

  [1432, 20],

  [1433, 21],

  [1434, 21],

  [1435, 20],

  [1436, 20],

  [1437, 21],

  [1438, 21],

  [1439, 20],

  [1440, 20],

  [1441, 20],

  [1442, 21],

  [1443, 20],

  [1444, 20],

  [1445, 20],

  [1446, 21],

  [1447, 20],

  [1448, 20],

  [1449, 20],

  [1450, 21],

  [1451, 20],

  [1452, 20],

  [1453, 20],

  [1454, 21],

  [1455, 20],

  [1456, 20],

  [1457, 20],

  [1458, 21],

  [1459, 20],

  [1460, 20],

  [1461, 20],

  [1462, 21],

  [1463, 20],

  [1464, 20],

  [1465, 20],

  [1466, 21],

  [1467, 20],

  [1468, 20],

  [1469, 20],

  [1470, 21],

  [1471, 20],

  [1472, 20],

  [1473, 20],

  [1474, 20],

  [1475, 20],

  [1476, 20],

  [1477, 20],

  [1478, 20],

  [1479, 21],

  [1480, 21],

  [1481, 21],

  [1482, 21],

  [1483, 21],

  [1484, 21],

  [1485, 21],

  [1486, 21],

  [1487, 21],

  [1488, 21],

  [1489, 21],

  [1490, 21],

  [1491, 21],

  [1492, 21],

  [1493, 21],

  [1494, 21],

  [1495, 21],

  [1496, 21],

  [1497, 21],

  [1498, 21],

];

for (const [persianYear, expectedDay] of nowruzDates) {

  const date = Temporal.PlainDate.from({

    year: persianYear,

    month: 1,

    day: 1,

    calendar: "persian"

});

  const isoDate = date.withCalendar("iso8601");

  TemporalHelpers.assertPlainDate(

    isoDate,

    persianYear + 621, 3, "M03", expectedDay,

    "Nowruz (1 Farvardin) of Persian year " + persianYear

);

reportCompare(0, 0);