Adding 14 days to January 25 gives February 8.
Two Weeks - 1920 was released on: USA: 25 January 1920 Finland: 28 February 1921 Portugal: 11 January 1924
Assuming the two dates are in adjacent years, there are 84 days between the two dates. This is a total of 84/7 = 12 weeks.
25 weeks and 5 days in a normal year and 25 weeks and 6 days in a leap year.
December 21
Robot Chicken - 2005 Two Weeks Without Food 4-8 was released on: USA: 25 January 2009
25 weeks (rounded down).
25 weeks and 6 days.
January 25, 2019
For the 6 months of January, February, March, April, May and June, there are 25 weeks and 6 days in a normal year and 26 weeks in a leap year.
14 weeks and 5 days in a normal year and 14 weeks and 6 days in a leap year.
That entirely depends on the context of this question. Two weeks (or one fortnight) prior to January 8th is December 25th and two weeks following January 8th in January 22nd. This is always the case since no leap day occurs during both periods before and after January 8th.
As today is the 3rd January you have two (2) weeks exactly today until the 17th.