fixes error in adverse events when `ASTDY` is of difftime type (#1284) #3181

Job	Run time
SuperLinter 🦸‍♀️	0s
Check URLs 🌐	0s
Grammar Check 🔤	0s
Style Check 👗	0s
Audit Dependencies 🕵️‍♂️ / oysteR scan 🦪	1m 41s
Coverage 📔 / Coverage 📔	9m 59s
Coverage 📔 / Covtracer 🐄	0s
R CMD Check (non-CRAN) 🧬 / ghcr.io/insightsengineering/rstudio, version latest	12m 6s
R CMD Check 🧬 / ghcr.io/insightsengineering/rstudio, version latest	1h 20m 26s
Roxygen 🅾 / Manual pages check 🏁	8m 30s
gitleaks 💧 / PII Check 💳	0s
Spell Check 🆎 / Check spelling 🔠	1m 39s
gitleaks 💧 / gitleaks 💧	3s
License Check 🃏 / Check 🚩	33s
Version Bump 🤜🤛 / Bump version ⤴	49s
Version Check 🏁 / Emoji in NEWS.md 📰	6s
Version Check 🏁 / Version check 🏁	2s
Coverage 📔 / Publish coverage report 📰	4s
R CMD Check (non-CRAN) 🧬 / Upload build tar.gz	0s
R CMD Check (non-CRAN) 🧬 / Publish JUnit HTML report 📰	6s
R CMD Check 🧬 / Upload build tar.gz	0s
R CMD Check 🧬 / Publish JUnit HTML report 📰	7s
	1h 56m 11s

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