Fill In Gaps - Missing Days In Range

I get given a csv file on a monthly basis which contains consumption data per day for the specified period. This sounds simple but on occasion (more often than not) the data has missing days. This can cause me problem later on in my analysis.

I can happily total the monthly consumption using the date and month text. What i want to do however is to sort the csv file into daily consumption and highlight the missing days i.e. have a range of the days in the month and allocate the daily data to the correct date. I currently do this manually but know that there must be a better, automated approach... searching for matching dates for example?

In my head i'm thinking the following approach but lack the coding skills to do it.

1. Define the start and end dates. Perhaps count the number of days between the two dates and autofill the start date down the appropriate number of days in column A?

2. Paste the csv file into a different sheet and, starting from the top, cut and paste the csv data to the correct date created in step 1. Do this for each row based on the csv data.