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Returns the date from an ITCH-filename
get_date_from_filename(file)
the date as fastPOSIXct
a filename
get_date_from_filename("03302017.NASDAQ_ITCH50") get_date_from_filename("20170130.BX_ITCH_50.gz") get_date_from_filename("S030220-v50-bx.txt.gz") get_date_from_filename("unknown_file_format")
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