舍入时间，Power Bi

Question

I am looking at using the ROUNDDOWN function.

I want to ROUNDDOWN time in all transactions made in a specific hours throughout the day. Say there were 15 transactions between 9:00 am and 9:59 am.. 9:01:02am, 9:10:05am, 9:45:52am etc.. All rounddown to 9:00:00am or 9:00am so I can measure day by the hour.

I have tried

= ROUNDDOWN(Query[TIME], 1) //which messes up the result



= ROUNDDOWN(Query[TIME], "1:00") //which gives me an error, cannot convert value

The time is in H:mm:ss

Answer 1

If you are doing this in PowerBI with DAX you can use HOUR to extract the only the hour-part from a time-column:

TIME(HOUR(Query[TIME]);0;0)