a brace
pair (e.g. <em>{yesterday}</em>, <em>{1 month 2 weeks 3 days 1 hour 1
second ago}</em> or <em>{1979-02-26 18:30:00}</em>) specifies the value
of the ref at a prior point in time.  This suffix may only be
used immediately following a ref name and the ref must have an
existing log (<em>$GIT_DIR/logs/&lt;ref&gt;</em>). Note that this looks up the state
of your <strong>local</strong> ref at a given time; e.g., what was in your local
<em>master</em> branch last week. If you want to look at commits made d