Open issues from original repo

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They were closed as "not planned", but I assume most of them are still relevant.

• Need rewrite rules for fromIntegral vincenthz/hs-hourglass#27
• timeAdd ignores NanoSeconds vincenthz/hs-hourglass#32
• timeParse for ISO8601_DateTime does not parse nanoseconds vincenthz/hs-hourglass#35
• Support optional format parts in TimeFormatString vincenthz/hs-hourglass#37
• timezoneCurrent is very incorrect on Raspberry Pi, and slightly incorrect on desktop systems vincenthz/hs-hourglass#38
• Wishlist: formatting for TimeIntervals vincenthz/hs-hourglass#39
• Integral instance for NanoSeconds vincenthz/hs-hourglass#40
• Document TimeFormat String instance vincenthz/hs-hourglass#44
• Unix time plus milliseconds parsed incorrectly vincenthz/hs-hourglass#50
• Add support for ordinal dates (day of the year) formatting vincenthz/hs-hourglass#51
• Add a rationalToElapsedP function vincenthz/hs-hourglass#52
• [Windows] Cannot print dates before January 1, 1601 vincenthz/hs-hourglass#53
• FTBFS on x32 architecture vincenthz/hs-hourglass#54
• Package test suite fails to build on GHC 9.4.2 vincenthz/hs-hourglass#55