Git的提交日期或作者日期时间戳的解析是什么？ [英] What is the resolution of Git's commit-date or author-date timestamps?

问题描述

从我可以看到，Git提交日期和作者日期只能准确到1秒钟。我想知道如果这是精确的，他们得到或可以得到时间戳，以毫秒或甚至微秒。

From what I can see, Git commit dates and author dates are only accurate to one second. I'm wondering if this is as precise as they get or can I get the timestamp in milliseconds or even microseconds.

此命令返回 UNIX Timestamp 使用第一个提交的提交哈希：

This command returns the UNIX Timestamp using the commit hash of the first commit:

git show -s --format="%ct" 2d9afdfb9e2fa9b349312734b462bb7d57a684ee

结果： 1421437899

Result: 1421437899

什么是GIT的提交日期或作者日期时间戳精度？

What is GIT's commit-date or author-date timestamp precision?

推荐答案

Git提交/作者日期的解决方案是1秒，正如 Alexey Ten 和爱德华·汤姆森，也是解决Unix时间戳。

The resolution of Git commit/author dates is 1 second, which, as pointed out by Alexey Ten and Edward Thomson, is also the resolution of Unix timestamps.

可以进行的一个有趣的体验是

An interesting experience you can conduct is to

• 创建一个提交，并且


• 修改它很快，而不改变任何东西（甚至不提交消息）。

您可能知道，修改提交实际创建一个新的提交。通常，新提交将具有不同的时间戳，因此与第一个提交的提交ID不同。但是，您可以编写一个创建提交并修改它的脚本，希望在同一个系统时钟秒内生成一个与第一个哈希值相同的提交。

As you may know, amending a commit actually creates a new commit. Normally, the new commit would have a different timestamp, and, therefore, a different commit ID from that of the first commit. However, you can write a script that creates the commit and amends it, hopefully within the same system-clock second, thereby producing a commit with the same hash as the first one.

首先，设置东西：

$ mkdir testGit
$ cd testGit
$ git init

然后将其写入脚本文件（称为 commitAmend.sh 以下）

Then write this to a script file (called commitAmend.sh below)

#!/bin/sh

# create content and commit
printf "Hello World.\n" > README.md
git add README.md
git commit -m "add README"
git log

# amend the commit
git commit --amend --no-edit
git log

并运行它：

$ sh commitAmend.sh
[master (root-commit) 11e59c4] add README
 1 file changed, 1 insertion(+)
 create mode 100644 README.md
commit 11e59c47ba2f9754eaf3eb7693a33c22651d57c7
Author: Jubobs <xxxxxxxxxxx>
Date:   Fri Jan 30 14:25:58 2015 +0000

    add README
[master 11e59c4] add README
 Date: Fri Jan 30 14:25:58 2015 +0000
 1 file changed, 1 insertion(+)
 create mode 100644 README.md
commit 11e59c47ba2f9754eaf3eb7693a33c22651d57c7
Author: Jubobs <xxxxxxxxxxx>
Date:   Fri Jan 30 14:25:58 2015 +0000

add README

相同的时间戳，相同的哈希！

Same timestamp, same hash!

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