What is the start of first window in Kafka Streams/Ksqldb Time windows

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Kafka Streams and ksqlDB are based on the Unix epoch time in the UTC timezone. So my question is. If i define a tumbling window with window size of 5 minutes, the first windows will begin at 00:00:00 UTC on 1 January 1970? I mean the boundaries (start and end) of a window are tied this way? First Window Second Window Third Window 00:00:00 UTC -> 00:05:00 UTC -> 00:10:00 UTC -> ...

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