Cast int96 timestamp from parquet to golang

Question

Having this 12 byte array (int96) to timestamp.

[128 76 69 116 64 7 0 0 48 131 37 0]

How do I cast it to timestamp?

I understand the first 8 byte sho

Answer 1

@Zoltan you definitely deserve the vote although you didn't supply a Golang sulotion.

Thanks to you and to https://github.com/carlosjhr64/jd

I wrote a function func int96ToJulian(parquetDate []byte) time.Time

playground

func int96ToJulian(parquetDate []byte) time.Time {
    nano := binary.LittleEndian.Uint64(parquetDate[:8])
    dt := binary.LittleEndian.Uint32(parquetDate[8:])

    l := dt + 68569
    n := 4 * l / 146097
    l = l - (146097*n+3)/4
    i := 4000 * (l + 1) / 1461001
    l = l - 1461*i/4 + 31
    j := 80 * l / 2447
    k := l - 2447*j/80
    l = j / 11
    j = j + 2 - 12*l
    i = 100*(n-49) + i + l

    tm := time.Date(int(i), time.Month(j), int(k), 0, 0, 0, 0, time.UTC)
    return tm.Add(time.Duration(nano))
}