Formula to get the dates of all Sundays in the year

I am trying to create a spreadsheet with all the dates of Sunday in one column. How can I go about doing this? I have tried by using DAYVALUE(1), but cant get that to return a date.

First, e.g. in Calendar, lookup the date of the first Sunday in January for the year you want to create the spreadsheet of Sundays in a year. For this example, lets use the first Sunday in January of 2017, i.e. January 1, 2017.

In Numbers, e.g.:

• Set A1 to: Date
• Set A2 to: January 1, 2017
• Set A3 to: =A2+7
• Drag A3 down to: A54