Inserting new data to dataframe with Date index

Question

I have a DF like below with Date value as Index

I have the 6 values in an array and i have added 6 more values to the same array like:

Now i need to append the whole 12 values to the same array with new Date index value like below:

When i try to set the value using test['value'] = new_values , it is giving the below error:

ValueError: Length of values (18) does not match length of index (12)

Please help