date - 如果有逗号，Golang 无法解析毫秒？

Question

这是一个示例，我想解析的数据中的日期如何:

2017-10-20 13:32:26,890

我的格式如下:

2006-01-02 15:04:05,000

现在奇怪的部分:

date := "2017-10-20 13:32:26,890"
_, err := time.Parse("2006-01-02 15:04:05,000", date)
if err != nil {
    panic(err)
}

如果我运行此命令，我会收到此错误:

panic: parsing time "2017-10-20 13:32:26,890" as "2006-01-02 15:04:05,000": cannot parse "890" as ",000"

如果我将日期和格式中的逗号更改为单个点，它就可以正常工作。我可以用正则表达式替换逗号，但为什么会发生这种情况？

Answer 1

此问题已通过 f02a26be [1] (2021-03-15) 修复。引用新文档 [2]:

Either a comma or decimal point followed by one or more nines represents a fractional second, printed to the given number of decimal places, with trailing zeros removed.

1. https://github.com/golang/go/commit/f02a26be
2. https://tip.golang.org/pkg/time#pkg-constants