Typo: UCT -> UTC

[jason-curtis]

• [(no issue)] closes #xxxx
• [(didn't change code)] tests added / passed
• [(didn't change .py files)] passes git diff upstream/master -u -- "*.py" | flake8 --diff
• [(seems unnecessary)] whatsnew entry

[jbrockmendel]

LGTM, ping on green.

[codecov]

Codecov Report

Merging #22548 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22548   +/-   ##
=======================================
  Coverage   92.04%   92.04%           
=======================================
  Files         169      169           
  Lines       50783    50783           
=======================================
  Hits        46741    46741           
  Misses       4042     4042

Flag	Coverage Δ
#multiple	90.45% <ø> (ø)	⬆️
#single	42.22% <ø> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1a798be...a974cb3. Read the comment docs.

[jason-curtis]

🍏

[jreback]

thanks!