fix atol in At for Dates

[rafaqz]

Closes #827

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.46%. Comparing base (328e105) to head (82bcc2a).
Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #834      +/-   ##
==========================================
- Coverage   84.67%   84.46%   -0.21%     
==========================================
  Files          47       48       +1     
  Lines        4599     4629      +30     
==========================================
+ Hits         3894     3910      +16     
- Misses        705      719      +14     

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