Question 1

How do I use ISO 8601 Date Formatter in a Swift project?

Accepted Answer

Add the source files to your Xcode project and import the module. Since it's Objective-C, use bridging headers or Swift interoperability, but be prepared to handle manual memory management in parts without ARC.

Question 2

ISO 8601 Date Formatter vs NSDateFormatter for ISO 8601 dates?

Accepted Answer

This library is more robust for strict ISO 8601 compliance, supporting week/ordinal formats and flexible parsing, while NSDateFormatter may struggle with locale issues and missing features like week dates.

Question 3

How to enable strict date validation with this library?

Accepted Answer

Set the formatter's strict property to YES. This enforces sanity checks on input strings, rejecting out-of-range numbers and ensuring the date is the entire string content, as described in the parsing section.

Question 4

Can this library handle week dates like 2025-W15?

Accepted Answer

Yes, it fully supports ISO 8601 week dates for parsing and generation, using an optimized algorithm mentioned in the implementation details, making it ideal for applications dealing with week-based schedules.

Question 5

What are common pitfalls when using this formatter?

Accepted Answer

Watch out for time zone handling with DST, as early versions had bugs, and remember it doesn't parse substrings. Also, ensure thread safety by relying on its built-in caching rather than manual management.

Question 6

How to add support for millisecond precision?

Accepted Answer

The library already supports fractional seconds up to milliseconds in time specifications, as noted in version 0.8 updates. Use the appropriate properties to include them in generated strings or parse them from inputs.

Question 7

Is there a way to parse dates from the middle of a string?

Accepted Answer

No, this is a known limitation; the parser only works from the start of the string after whitespace. You'd need to extract the date substring manually before parsing, as mentioned in the bugs section.

iso-8601-date-formatter

What is iso-8601-date-formatter?

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