Extracting month, day of week, hour from time attribute
You can derive individual time components, such as month, day of week, and hour from timestamp attributes of your dataset.
Just click "derive" button of your attribute/summary, and click the time feature you'd like to extract from this data.
Note that Keshif detects which time feautres would be supported. For example, if your input is in date only (and does not include time of day), you'll not be able to extract "hour" summary.