Output size for each file during copying.
Installed tzinfo
Short code to demonstrate how to get utc_offset using TZInfo.
Use printf to format output.
Extract method: copy_single_file.
Rename function.
Move output of timestamp out of copy_files.
Move script into separated folder.
Add test data for cp_by_date.
Rename script
Refine test data.
Use function all_days replace ALL_DAYS.
Ignore the days that already imported.
Output when all files copied.