proposal: time: add civil time package

I propose a package with minimal implementations of the types Date, Time and DateTime, which represent times without a corresponding location. A civil time or date does not represent a point or interval of time, but they are useful for representing events transpiring between humans. For example, your birthday begins at midnight on your birthdate regardless of where you are in the world. If you're turning 21, you can buy a drink in New York at midnight, but teleport instantaneously to San Francisco and you'll be denied, because it is 9 PM the day before. In practice, the main motivation for these types is to represent values in database-like storage systems, like BigQuery and Spanner (and other, non-Google products). The package currently exists at cloud.google.com/go/civil, and has been in use by the BigQuery and Spanner client libraries for a few months. For now, I'd like to move it to golang.org/x/time/civil. It is probably too esoteric to be worth including in the standard library, but if there were ever a "second-tier" set of packages that augmented the standard library, it could live there. (See #17244.) A CL is in progress at https://go-review.googlesource.com/c/38571.

Posted by jba on Mar 24, 2017, 6:54 PM

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