Overview

Convert the date construction, conversion, and block operation builtins in vm_builtin_datetime.cpp to use RAII value types. More complex than the field extractors due to more arguments and ownership considerations.

Scope of Work

• src/mongo/db/exec/sbe/vm/vm_builtin_datetime.cpp — builtinDate, builtinDateToString, builtinDateFromString, builtinDateFromStringNoThrow, builtinDateWeekYear, builtinDateToParts, builtinIsoDateToParts, builtinDateTrunc, builtinDateDiff, builtinDateAdd, builtinCurrentDate, builtinValueBlockDateTrunc, builtinValueBlockDateDiff, builtinValueBlockDateAdd

Technical Notes

Apply after the field extractor ticket (SERVER-126038). Block variants (builtinValueBlock*) operate on arrays of values rather than individual stack reads — review the ownership model carefully for those.