python - 从与 1970-1-1 不同的年份开始的日期时间索引

Question

I am trying to transform my index to a date starting from the year 2000. pd.to_datetime() only allows me to start at 1970.

df = pd.DataFrame({"R1": [90,-92,1,5,8,11,2,2,58,3], "R2": [80,5,1,6,56,14,5,3,2,8]})
df

df.index

df_index_date_wrongoutput = pd.to_datetime(df.index, unit="D")
df_index_date_wrongoutput

#desired Output

# EDIT ORIGIN ERROR

# EDIT2: date_parameters

Answer 1

在to_datetime中使用参数origin :

df.index = pd.to_datetime(df.index, unit="D", origin='2000-01-01')
print (df)
            R1  R2
2000-01-01  90  80
2000-01-02 -92   5
2000-01-03   1   1
2000-01-04   5   6
2000-01-05   8  56
2000-01-06  11  14
2000-01-07   2   5
2000-01-08   2   3
2000-01-09  58   2
2000-01-10   3   8