.) Returns null if the value doesn't exist, is not a string, or is not parsable as a date. NOTE: This is not a generic date parser! It only recognizes the ISO-8601 format, with or without milliseconds.</p><span class="kdoc-tag"><h4 class="">Return</h4><p class="paragraph">the Instant date value or null.</p></span><h4 class="">Parameters</h4><div class="table"><div class="table-row" data-filterable-current=":couchbase-lite/commonMain" data-filterable-set=":couchbase-lite/commonMain"><div class="main-subrow k