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¿Por qué JavaScript devuelve un tiempo diferente cuando usamos TimeZone vs + firmar en la cadena?

Quiero analizar una fecha y hora de cadena en un objeto Fecha de JavaScript. Me pregunto por qué usar +Number en la cadena me da un resultado diferente al usar (TimeZome)

Ejemplo:

 let a = new Date('Nov 01, 2022 09:00:00 +0900') let b = new Date('2022-11-01T09:00:00.000+09:00') let c = new Date('01 Nov 2022 09:00:00 (JST)') let d = new Date('Nov 01, 2022 09:00:00 (JST)') console.log(`${a.getTime()} ${a.toISOString()} ${a.toLocaleString('en-us', { timeZone: 'JST' })}`); console.log(`${b.getTime()} ${b.toISOString()} ${b.toLocaleString('en-us', { timeZone: 'JST' })}`); console.log(`${c.getTime()} ${c.toISOString()} ${c.toLocaleString('en-us', { timeZone: 'JST' })}`); console.log(`${d.getTime()} ${d.toISOString()} ${d.toLocaleString('en-us', { timeZone: 'JST' })}`);

el resultado es

 "1667260800000 2022-11-01T00:00:00.000Z 11/1/2022, 9:00:00 AM" "1667260800000 2022-11-01T00:00:00.000Z 11/1/2022, 9:00:00 AM" "1667318400000 2022-11-01T16:00:00.000Z 11/2/2022, 1:00:00 AM" "1667318400000 2022-11-01T16:00:00.000Z 11/2/2022, 1:00:00 AM"

¡Parece que usar (JST) no genera el resultado correcto!

Nota: obtengo el mismo resultado cuando uso Date.parse

about 4 years ago · Juan Pablo Isaza
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