Copying column from one data frame to another based on matching of combination of two columns

I have got two dataframes (i.e. df1 and df2). df1 contains date and time columns. Time columns contains 30 minutes interval of time series: df1: date time 0 2015-04-01 00:00:00 1 2015-04-01 00:30:00 2 2015-04-01 01:00:00 3 2015-04-01 01:30:00 4 2015-04-01 02:00:00 df2 contains date, start-time, end-time, value: df2 INCIDENT_DATE INTERRUPTION_TIME RESTORE_TIME WASTED_MINUTES 0 2015-04-01…

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