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Two exports of one project differed in the creation and modification dates (the time of the export, in local time) and in the document id (random). With SOURCE_DATE_EPOCH set (reproducible-builds.org), --export-pdf now uses the time it names, in UTC, and a document id derived from the project: version 5 of the project uuid with the SHA-256 of the project file, so it is the same for the same file and changes when the file does. Qt has no setter for the dates, so PdfLinks::setDocumentDate() rewrites them in the document information and the XMP metadata after the file is written, fixing the XMP /Length and shifting the xref table. Without the variable nothing changes. Only --export-pdf reads it; the print window's PDF export does not, as a person exporting by hand wants the real date. qet_export (misc/qet-mcp) gains "reproducible" and "source_date_epoch". It reports whether the build honoured the variable, since an older one ignores it. tst_pdfreproducible exports examples/741.qet four times and requires identical bytes and the epoch's date; it fails with either this change or the hash seed fix reverted. Projects with cross-reference links also need their links in a fixed order, which is a separate fix. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>