I have data look like this
Date Time Open High Low Close Volume
0 2013.07.09 7:00 101.056 101.151 101.016 101.130 1822
1 2013.07.09 8:00 101.130 101.257 101.128 101.226 2286
2 2013.07.09 9:00 101.226 101.299 101.175 101.180 2685
3 2013.07.09 10:00 101.178 101.188 101.019 101.154 2980
4 2013.07.09 11:00 101.153 101.239 101.146 101.188 2623
How to combine Date column and Time column into one column which is Date Time. And I wonder if i do that whether I have to change the string to date. Thank in advance.