How to create a dataframe from timestamp values

[MohanReddy]

date_cols = ['CLOSE', 'D_MONTH', 'OPEN']
gbl = globals()
for i in date_cols:
    gbl[i] = pd.to_timedelta(min(data_frame_1[i]), unit='s') + pd.datetime(1960, 1, 1)

I am getting the output as below

Output:
>OPEN
Out[520]: Timestamp('1993-02-12 00:00:00')
>CLOSE
Out[522]: Timestamp('2009-04-30 00:00:00')
>D_MONTH
Out[523]: Timestamp('2018-01-01 00:00:00')

But I want the output like below as a dataframe not as a timestamp:

Output:
Attr		Min_Date
CLOSE       2009-04-30 00:00:00
OPEN        1993-02-12 00:00:00
D_MONTH     2018-01-01 00:00:00