Easel.ly is a simple web tool that empowers anyone to create and share powerful visuals (infographics, posters)... no design experience needed! We provide the canvas, you provide the creativity.
If you're using the TimelineJS Google spreadsheet template, first make sure the cell you want to modify is set to Plain Text - "Format > Number > Plain Text." Then simply enter the year (e.g. 1994) or month and year (e.g. 7/1979).