amp-with-time-zone-function.html"><span class="token function">CustomTimestampWithTimeZoneFunction</span></a><span class="token punctuation">(</span><span class="parameters "><span class="parameter ">functionName<span class="token operator">: </span><a href="https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html">String</a><span class="token punctuation">, </span></span><span class="parameter "><span class="token keyword">vararg </span>params<span class="token operator">: </span><a href="..