Pro tip on Date Formatting: y and yyyy are ordinary calendar year. While Y and YYYY are week-based calendar year. 12/30/2019 and 12/31/2019 are good test cases because their week-based calendar year is 2020.
Pro tip on Date Formatting: y and yyyy are ordinary calendar year. While Y and YYYY are week-based calendar year. 12/30/2019 and 12/31/2019 are good test cases because their week-based calendar year is 2020.