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[SR-13218] Swift's ISO8601DateFormatter doesn't parse all valid RFC3339 dates #55658

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swift-ci opened this issue Jul 14, 2020 · 0 comments
Open

[SR-13218] Swift's ISO8601DateFormatter doesn't parse all valid RFC3339 dates #55658

swift-ci opened this issue Jul 14, 2020 · 0 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.

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Previous ID SR-13218
Radar https://feedbackassistant.apple.com/feedback/7999894
Original Reporter kerrmarin (JIRA User)
Type Bug
Environment

Xcode Version 11.5 (11E608c)

Additional Detail from JIRA
Votes 0
Component/s
Labels Bug
Assignee None
Priority Medium

md5: 518c44c95703fc867fc7955333957c79

relates to:

  • SR-12104 ISO8601DateFormatter fails to parse "2013-11-01T00:00.00Z"

Issue Description:

The ISO8601 standard RFC 3339 states that all of these:

1985-04-12T23:20:50.52Z
1996-12-19T16:39:57-08:00 //does work
1996-12-20T00:39:57Z //does work
1990-12-31T23:59:60Z
1937-01-01T12:00:27.87+00:20

are valid dates. However, the `ISO8601DateFormatter` doesn't decode all these. It decodes the ones with the "//does work".

Also, the `JSONDecoder` class with `dateDecodingStrategy` of `.iso8601` fails in the same way.

You can reproduce with this in a playground:

import Foundation
let formatter = ISO8601DateFormatter()
let dates = [
    "1985-04-12T23:20:50.52Z",
    "1996-12-19T16:39:57-08:00", //works
    "1996-12-20T00:39:57Z", // works.
    "1990-12-31T23:59:60Z",
    "1990-12-31T15:59:60-08:00",
    "1937-01-01T12:00:27.87+00:20"
]
let result: [Date?] = dates.map {
    return formatter.date(from: $0)
}
print(result)
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior.
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