pandas - How to convert datetime.time columns in dataframe to string -

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i've been struggling convert 2 columns in pandas. frame contains many columns, , 2 columns dates: 'datelog'(is date) , 'timeofday' (is time). column datelog string. column timeofday datetime.time() format. dateframe display folows:

     datelog timeofday 0  30-apr-15  14:15:43 1  30-apr-15  14:16:13 2  30-apr-15  14:16:43 3  30-apr-15  14:17:13 4  30-apr-15  14:17:43 5  30-apr-15  14:18:13 6  30-apr-15  14:18:43 7  30-apr-15  14:19:13 8  30-apr-15  14:19:43 9  30-apr-15  14:20:13

my goal concatenate these 2 column use them index timeseries. can point me in right direction?

i think can use create index:

df.index = df['datelog'] + ' ' + df['timeofday'].astype(str)

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