ISO8601DateFormatter返回nil，用于从有效字符串转换为日期

Question

我有一个ISO8601字符串，我想将其转换为Date对象，但我一直得到一个nil，即使它是一个有效的字符串。这是我的代码：

let isoFormatter = ISO8601DateFormatter()
isoFormatter.formatOptions = [
.withFractionalSeconds,
.withInternetDateTime,
.withFractionalSeconds,
.withColonSeparatorInTime,
.withDashSeparatorInDate
]
let date = isoFormatter.date(from: self)

我的字符串是2020-04-10T21:13:40.880000，2020-04-10T21:13:40(无毫秒(也会发生同样的情况

Answer 1

.withInternetDateTime是withFullDate、withFullTime、withDashSeparatorInDate、withColonSeparatorInTime和withColonSeparatorInTimeZone的组合。该选项在字符串中需要一个时区，并且适用于"2020-04-10T21:13:40.880000Z"，请注意后面的Z。

选项withDashSeparatorInDate、withColonSeparatorInTime在代码中是多余的(除了重复的withFractionalSeconds(。

---

要省略时区，必须将withInternetDateTime替换为withFullDate和withTime

let isoFormatter = ISO8601DateFormatter()
isoFormatter.formatOptions = [
.withFractionalSeconds,
.withFullDate,
.withTime, // without time zone
.withColonSeparatorInTime,
.withDashSeparatorInDate
]