Oxford University, the British Library, and the National Library of Australia have the sheet music, described thus:

THE REST OF THE DAY'S YOUR OWN
Written and composed by Worton David and J.P. Long ; sung by Jack Lane.
London : Francis, Day & Hunter, ©1915.

First line: One day when I was out of work a job I went to seek.

[Note this contradicts the DT, which says Jack Lane wrote it.]