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Simply enter the year. Earlier versions of TimelineJS required you to enter a date as January 1 of a given year with no time to do this, but now you should just enter the full year (four digits for recent events, or negative numbers for BC) in the "start date" or "end date" columns. You may need to change the format of the cells in Google Spreadsheet so that it doesn't change your plain year into a full date. To do this, select all the cells you want to change and select "Format > Number > Plain Text" from the Google Spreadsheet menus.
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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).
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Earlier versions of TimelineJS required you to enter a date as January 1 of a given year to do this, but now you should just enter the full year, as explained above.