Added support for unix nano and milliseconds

fixes #44

Author: Ed Anderson

README.md

@@ -31,7 +31,11 @@ v, _ := query.Values(opt)
 fmt.Print(v.Encode()) // will output: "q=foo&all=true&page=2"
 ```
 
+See the [package godocs][] for complete documentation on supported types and
+formatting options.
+
 [go-github]: https://github.com/google/go-github/commit/994f6f8405f052a117d2d0b500054341048fbb08
+[package godocs]: https://pkg.go.dev/github.com/google/go-querystring/query
 
 ## Alternatives ##
 

query/encode.go

@@ -82,7 +82,9 @@ type Encoder interface {
 //
 // time.Time values default to encoding as RFC3339 timestamps.  Including the
 // "unix" option signals that the field should be encoded as a Unix time (see
-// time.Unix())
+// time.Unix()).  The "unixmilli" and "unixnano" options will encode the number
+// of milliseconds and nanoseconds, respectively, since January 1, 1970 (see
+// time.UnixNano()).
 //
 // Slice and Array values default to encoding as multiple URL values of the
 // same name.  Including the "comma" option signals that the field should be
@@ -270,6 +272,12 @@ func valueString(v reflect.Value, opts tagOptions) string {
 		if opts.Contains("unix") {
 			return strconv.FormatInt(t.Unix(), 10)
 		}
+		if opts.Contains("unixmilli") {
+			return strconv.FormatInt((t.UnixNano() / 1e6), 10)
+		}
+		if opts.Contains("unixnano") {
+			return strconv.FormatInt(t.UnixNano(), 10)
+		}
 		return t.Format(time.RFC3339)
 	}
 

query/encode_test.go

@@ -72,6 +72,18 @@ func TestValues_BasicTypes(t *testing.T) {
 			}{time.Date(2000, 1, 1, 12, 34, 56, 0, time.UTC)},
 			url.Values{"V": {"946730096"}},
 		},
+		{
+			struct {
+				V time.Time `url:",unixmilli"`
+			}{time.Date(2000, 1, 1, 12, 34, 56, 0, time.UTC)},
+			url.Values{"V": {"946730096000"}},
+		},
+		{
+			struct {
+				V time.Time `url:",unixnano"`
+			}{time.Date(2000, 1, 1, 12, 34, 56, 0, time.UTC)},
+			url.Values{"V": {"946730096000000000"}},
+		},
 	}
 
 	for _, tt := range tests {