whereMonth 获取月份异常

[hongfs]

当前日期为 31 号，strtotime('last month') 获取的并不是上一个月的时间，而是本月的时间。

https://stackoverflow.com/questions/9058523/php-date-and-strtotime-return-wrong-months-on-31st

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (7b0b8ea) 12.24% compared to head (aba7264) 12.24%.

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Additional details and impacted files

@@             Coverage Diff              @@
##                3.0     #507      +/-   ##
============================================
- Coverage     12.24%   12.24%   -0.01%     
- Complexity     2965     2966       +1     
============================================
  Files            64       64              
  Lines          7128     7130       +2     
============================================
  Hits            873      873              
- Misses         6255     6257       +2     

Flag	Coverage Δ
unittests	12.24% <0.00%> (-0.01%)	⬇️

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Files	Coverage Δ
src/db/concern/TimeFieldQuery.php	0.00% <0.00%> (ø)

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