Click the "Select File" button above, and choose your DAY file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert DAY to another file type
To convert DAY reports to another format, you need Novitus Mała Kasa or other Data software.
Convert a file to DAY
To convert other file formats to the "Fiscal Daily Report" file type, you need software like Novitus Mała Kasa or a similar tool.
About DAY files
A .DAY file is most commonly a Fiscal cash register daily report used by Polish fiscal hardware, such as the Novitus Mała Kasa. These files store a day's worth of transaction records, tax calculations, and receipts. The .DAY extension is also used for Microsoft Jet Database files (using the JetDB format), GRDC station data files from the Global Runoff Data Centre, and daily ZIP data archives generated by N.I.C.E. Axelerator software.
The main disadvantage of the .DAY format is its lack of standardization and extreme fragmentation. Fiscal .DAY files are often proprietary, strictly structured, and explicitly tied to specific local accounting software. They cannot be naturally opened by web browsers or standard text editors. Users typically need to convert these files into CSV, TXT, or PDF formats to audit sales data, share reports, or import records into modern accounting suites like QuickBooks or Xero.
Because .DAY files serve multiple completely different purposes across distinct industries, they are notoriously difficult to open or convert. Often, only the original software can properly read or export the data. Standard online converters fail to process them because they do not know which variant of the format they are dealing with. Just drag and drop your file to convert.guru to identify the format, view it, and convert it when possible. Our system will analyze the file signature to detect if it is a supported underlying format - like a ZIP archive, a JetDB database, or plain text - making viewing or conversion a reality.
Convert.Guru analyzes your DAY file, detects the exact format, and lets you read the text inside.
If you want to convert DAY file to CSV, JSON, XML, YAML, YML, TOML, INI, CFG, CONF, DAT, DB or SQL, you can use Novitus Mała Kasa or similar software from the "Daily Report Data Storage" category. In the File menu, look for Save As… or Export….
To convert DBF, XML, SQLITE, XLSX, SQL, TSV, ACCDB, YAML, MDB, CSV, ODS or JSON files to DAY, try Novitus Mała Kasa or another comparable tool in the "Daily Report Data Storage" category.
The DAY Converter Story
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our DAY converter.