// Package jsonlog provides helper functions to parse and print time (time.Time) as JSON.
 package jsonlog

 
 import (
 	"errors"
 	"time"
 )
 
 const (

 	// RFC3339NanoFixed is 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 is the format used by FastMarshalJSON
 	JSONFormat = `"` + time.RFC3339Nano + `"`

 )
 

 // FastTimeMarshalJSON avoids one of the extra allocations that

 // time.MarshalJSON is making.

 func FastTimeMarshalJSON(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
 }