Home

GDTT documentation

In brief

GDTT — Data Transform Tool by Gadash (Akila DJ) is a local Windows desktop app for data forging, transformations and aggregation, mainly for air-quality and other environmental time-series data. It reads CSV, TSV, delimited TXT and XLSX, lets you review explicit rules, and verifies exported CSV/Excel files.

Current documented release: v0.10.2-rc.1. It is an unsigned pre-release. Automated Windows/Linux checks and build-host C-lite isolation passed; separate hands-on clean-Windows acceptance and actual monitor-scaling review remain pending. Read Release status and safety before use. Passing checks is not a guarantee of correctness for every dataset.

Download and start · Report a problem · Source repository

Choose a workflow

Your task	Guide
Select/rename/reorder fields, convert formats, adjust timezones or regularize a sampling grid	Reformat and batch processing
Calculate statistics over periods with explicit completeness rules	Averaging and completeness
Split by fields or calendar periods; combine files or join parameters by timestamp	Splitting and joining

AQI generation and Reshape/Pivot are not implemented. A specification proposal or historical phase note is not proof that a feature is available.

How the normal workflow works

flowchart LR
    Mode --> File --> Inspect --> Configure --> Preview --> Validate --> Export --> Verify

Loading

Detection provides suggestions, not permission to change the data. Review timestamp meaning, source timezone, missing markers and sampling interval. A bounded preview is not the full exported dataset; full-file execution and reopening verification occur later.

Read in detail

1. Getting started: portable versus installer, downloads and first run.
2. Reformat and batch: inspection, field mapping and compatible files.
3. Formats and timezones: ISO, Custom, decimals and UTC.
4. Gaps and missing values: optional gap rows, nulls and sentinels.
5. Averaging and completeness: Direct/Incremental, periods and statistics.
6. Splitting and joining: parameters, exact-time joins and calendar splits.
7. Export and verification: filenames, reports, templates and result checks.
8. Files and folders: user data, logs, source tree and generated builds.
9. Appearance and accessibility: themes, font sizes and resizing.
10. Architecture and development: modules, diagrams and repeatable checks.
11. Release status and safety: tested evidence, limitations and acceptance checklist.
12. Troubleshooting and FAQ: common decisions and safe bug reports.
13. License, credits and support: copyright, OpenAI Codex, libraries and support.

Sponsor / Help

Support is optional: Gadash on Ko-fi · GDTT project support.

See Sponsor and help GDTT for details and ways to help without donating.

Documentation scope

Reviewed 2026-09-17 against app 0.10.2 and its published RC1. This wiki is a curated user guide, not a replacement for the original specification, changelog, versioned documentation map, or actual release evidence. Historical documents may describe older phases; prefer this guide and the current release notes for availability.