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Utilities for supporting date time functions

Sources for datetime are adapted from Howard Hinnant's date library (https://github.com/HowardHinnant/date).

Sources are taken from changeset 5bdb7e6f31fac909c090a46dbd9fea27b6e609a4 of the above project.

The following changes are made:

• fix internal inclusion paths (from "date/xxx.h" to simply "xxx.h")
• enclose the date namespace inside the arrow_vendored namespace
• fix 4 declarations like CONSTCD11 date::day operator "" _d(unsigned long long d) NOEXCEPT; to not have offending whitespace for modern clang: CONSTCD11 date::day operator ""_d(unsigned long long d) NOEXCEPT;

How to update