A digital artefact has no physical characteristics, therefore cannot be dated independently of its claims as to the time when it was created or posted. What follows – along the lines of what Paolo Cherchi-Usai has written about the moving image, and of one of the main corollaries of the contention that we live in a ‘post-photographic era’ – is that a digital artefact cannot be regarded as a historical document. More than that: we cannot keep time digitally. Not without a commitment to establishing and maintaining common timelines. Not when I can turn around in a day or a year’s time and change the content of this post without leaving a discernible trace.