Number of weeks in 1780 year is 53 weeks
Weeks are according Australia calendar rules, Monday first day and weeks are Monday to Sunday

Week # From Date To Date Weeks from Now
Week 1 December 27, 1779 January 2, 1780 passed 12777 weeks ago
Week 2 January 3, 1780 January 9, 1780 passed 12776 weeks ago
Week 3 January 10, 1780 January 16, 1780 passed 12775 weeks ago
Week 4 January 17, 1780 January 23, 1780 passed 12774 weeks ago
Week 5 January 24, 1780 January 30, 1780 passed 12773 weeks ago
Week 6 January 31, 1780 February 6, 1780 passed 12772 weeks ago
Week 7 February 7, 1780 February 13, 1780 passed 12771 weeks ago
Week 8 February 14, 1780 February 20, 1780 passed 12770 weeks ago
Week 9 February 21, 1780 February 27, 1780 passed 12769 weeks ago
Week 10 February 28, 1780 March 5, 1780 passed 12768 weeks ago
Week 11 March 6, 1780 March 12, 1780 passed 12767 weeks ago
Week 12 March 13, 1780 March 19, 1780 passed 12766 weeks ago
Week 13 March 20, 1780 March 26, 1780 passed 12765 weeks ago
Week 14 March 27, 1780 April 2, 1780 passed 12764 weeks ago
Week 15 April 3, 1780 April 9, 1780 passed 12763 weeks ago
Week 16 April 10, 1780 April 16, 1780 passed 12762 weeks ago
Week 17 April 17, 1780 April 23, 1780 passed 12761 weeks ago
Week 18 April 24, 1780 April 30, 1780 passed 12760 weeks ago
Week 19 May 1, 1780 May 7, 1780 passed 12759 weeks ago
Week 20 May 8, 1780 May 14, 1780 passed 12758 weeks ago
Week 21 May 15, 1780 May 21, 1780 passed 12757 weeks ago
Week 22 May 22, 1780 May 28, 1780 passed 12756 weeks ago
Week 23 May 29, 1780 June 4, 1780 passed 12755 weeks ago
Week 24 June 5, 1780 June 11, 1780 passed 12754 weeks ago
Week 25 June 12, 1780 June 18, 1780 passed 12753 weeks ago
Week 26 June 19, 1780 June 25, 1780 passed 12752 weeks ago
Week 27 June 26, 1780 July 2, 1780 passed 12751 weeks ago
Week 28 July 3, 1780 July 9, 1780 passed 12750 weeks ago
Week 29 July 10, 1780 July 16, 1780 passed 12749 weeks ago
Week 30 July 17, 1780 July 23, 1780 passed 12748 weeks ago
Week 31 July 24, 1780 July 30, 1780 passed 12747 weeks ago
Week 32 July 31, 1780 August 6, 1780 passed 12746 weeks ago
Week 33 August 7, 1780 August 13, 1780 passed 12745 weeks ago
Week 34 August 14, 1780 August 20, 1780 passed 12744 weeks ago
Week 35 August 21, 1780 August 27, 1780 passed 12743 weeks ago
Week 36 August 28, 1780 September 3, 1780 passed 12742 weeks ago
Week 37 September 4, 1780 September 10, 1780 passed 12741 weeks ago
Week 38 September 11, 1780 September 17, 1780 passed 12740 weeks ago
Week 39 September 18, 1780 September 24, 1780 passed 12739 weeks ago
Week 40 September 25, 1780 October 1, 1780 passed 12738 weeks ago
Week 41 October 2, 1780 October 8, 1780 passed 12737 weeks ago
Week 42 October 9, 1780 October 15, 1780 passed 12736 weeks ago
Week 43 October 16, 1780 October 22, 1780 passed 12735 weeks ago
Week 44 October 23, 1780 October 29, 1780 passed 12734 weeks ago
Week 45 October 30, 1780 November 5, 1780 passed 12733 weeks ago
Week 46 November 6, 1780 November 12, 1780 passed 12732 weeks ago
Week 47 November 13, 1780 November 19, 1780 passed 12731 weeks ago
Week 48 November 20, 1780 November 26, 1780 passed 12730 weeks ago
Week 49 November 27, 1780 December 3, 1780 passed 12729 weeks ago
Week 50 December 4, 1780 December 10, 1780 passed 12728 weeks ago
Week 51 December 11, 1780 December 17, 1780 passed 12727 weeks ago
Week 52 December 18, 1780 December 24, 1780 passed 12726 weeks ago
Week 53 December 25, 1780 December 31, 1780 passed 12725 weeks ago