[Mono-bugs] [Bug 622127] New: System.DateTime could be better encoded (64 bits instead of 64+32)

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http://bugzilla.novell.com/show_bug.cgi?id=622127

http://bugzilla.novell.com/show_bug.cgi?id=622127#c0


           Summary: System.DateTime could be better encoded (64 bits
                    instead of 64+32)
    Classification: Mono
           Product: Mono: Class Libraries
           Version: unspecified
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: CORLIB
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: miguel at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


Our DateTime evolved slowly without understanding the underlying principles
that drove the original design.

In Mono's implementation we keep the date as a TimeSpan created from a 64-bit
int "ticks" as well as "kind" property that determines the kind of encoding
(this came from NET_2_0).

We could reimplement DateTime entirely on top of the 64-bit long as
DateTime.ToBinary returns a 64-bit long that fully encodes the datetime with
its kind.   The DateTime.FromBinary is the equivalent function that creates a
DateTime from an encoded binary.

So we could be saving both a lot of gratuitous bookkeeping as well as one int
for each DateTime in the system.

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