add the timeutils package

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)

timeutils/MAINTAINERS

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+Cristian Staretu <cristian.staretu@gmail.com> (@unclejack)

timeutils/json.go

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+package timeutils
+
+import (
+	"errors"
+	"time"
+)
+
+const (
+	// Define our own version of RFC339Nano because we want one
+	// that pads the nano seconds part with zeros to ensure
+	// the timestamps are aligned in the logs.
+	RFC3339NanoFixed = "2006-01-02T15:04:05.000000000Z07:00"
+	JSONFormat       = `"` + time.RFC3339Nano + `"`
+)
+
+func FastMarshalJSON(t time.Time) (string, error) {
+	if y := t.Year(); y < 0 || y >= 10000 {
+		// RFC 3339 is clear that years are 4 digits exactly.
+		// See golang.org/issue/4556#c15 for more discussion.
+		return "", errors.New("Time.MarshalJSON: year outside of range [0,9999]")
+	}
+	return t.Format(JSONFormat), nil
+}