<ul><li>The DateFormatter in iOS loses microseconds precision during conversion between string and Date types, leading to incorrect sorting orders.</li><li>To address this issue, the ISO8601DateFormatter can be used for parsing ISO8601 formatted timestamps with microseconds precision.</li><li>However, the withFractionalSeconds option of the ISO8601DateFormatter only preserves three digits, potentially leading to further loss of precision.</li><li>Previously, other topics related to date and timestamp handling in iOS were discussed, including a fast timestamp parser in Swift and date format changes in App Store receipts.</li></ul>

ISO8601DateFormatter and Fractional Seconds

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