Replace deprecated strftime with date in YiiRequirementChecker

[max-s-lab]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Fixed issues	#20489

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.47%. Comparing base (22889d3) to head (b4c5e33).

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #20498   +/-   ##
=========================================
  Coverage     64.47%   64.47%           
  Complexity    11578    11578           
=========================================
  Files           433      433           
  Lines         37604    37604           
=========================================
  Hits          24245    24245           
  Misses        13359    13359           

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[terabytesoftw]

It would be great to replace it everywhere in another PR.

[max-s-lab]

It seems that this is the only place where the PHP function strftime is used. In other places, strftime is an SQLite function. I may be wrong, but this is how I understand it.

[terabytesoftw]

It seems that this is the only place where the PHP function strftime is used. In other places, strftime is an SQLite function. I may be wrong, but this is how I understand it.

yes, it is correct.

[Arhell]

lgtm