fix: parseDate stop the js Date behavior that maps 2 digit years to 1900 - 1999

[shye0000]

This is the fix of the issue https://github.com/iamkun/dayjs/issues/1237

To achieve this, I just call the setFullYear method of the Date object to force the date object to have the exact year.

plus after reading the tests code, I've understood that one of the goals of the parseDate method is to align with momentjs, so in my opinion this fix would reinforce the alignment.

[codecov[bot]]

Codecov Report

Merging #1862 (81692ea) into dev (8757477) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev     #1862   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          181       181           
  Lines         2064      2067    +3     
  Branches       537       534    -3     
=========================================
+ Hits          2064      2067    +3     

Impacted Files	Coverage Δ
src/index.js	100.00% <100.00%> (ø)

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[BePo65]

This PR solves issue #596 too.

[BePo65]

This PR solves issue #596 too.

[shye0000]

@iamkun yo it's been a while since this PR has been created, would you plz take a look and maybe potentially include it in a future release?

[timmd909]

Any updates on this?

[shye0000]

@iamkun 哥们儿，看看咱这个PR呗 ;) @iamkun yo man, plz check this out ;)