// Helper to concatenate Uint8Arrays
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Temporal.Instant is an exact moment in time, it has no time zone, no daylight saving, no calendar. It represents elapsed time since midnight on January 1, 1970 (the Unix epoch). Unlike Date, which has a very similar data model, Instant is measured in nanoseconds rather than milliseconds. This decision was taken by the champions because even though the browser has some coarsening for security purposes, developers still need to deal with nanosecond-based timestamps that could have been generated from elsewhere.，更多细节参见WhatsApp Web 網頁版登入