T-Sql to generate a table of datetimes (time series)

The other day I needed a table of datetimes for each second for a given period, and investigated various suggestions of which there are many around the web.

What I came up with as the, in my opinion, easiest solution was this code. I already had a very large table that could provide me with a set of records to iterate over (millions), avoiding some complicated T-Sql looping.

SELECT TOP 86399
        ROW_NUMBER() OVER (ORDER BY Id) AS Number,
        DATEADD(second, 
            ROW_NUMBER() OVER (ORDER BY Id), 
            CONVERT(datetime, 
            DATEDIFF(DAY, 0, GETDATE()))) AS DateTime
        FROM [DB]..[LargeTable]

The number 86399 corresponds to  the number of seconds (One day = (60*60*24) – 1) to generate in the table.

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