diff --git a/model/email.go b/model/email.go
new file mode 100644
index 0000000..9e78d47
--- /dev/null
+++ b/model/email.go
@@ -0,0 +1,35 @@
+package model
+
+import (
+	"regexp"
+	"strings"
+)
+
+// emailAddressMatcher for valid email addresses.
+// See https://regex101.com/r/1BEPJo/latest for an interactive breakdown of the regexp.
+// See https://html.spec.whatwg.org/#valid-e-mail-address for the definition.
+var emailAddressMatcher = regexp.MustCompile(
+	// Start of string
+	`^` +
+		// Local part of the address. Note that \x60 is a backtick (`) character.
+		`(?P<local>[a-zA-Z0-9.!#$%&'*+/=?^_\x60{|}~-]+)` +
+		`@` +
+		// Domain of the address
+		`(?P<domain>[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+)` +
+		// End of string
+		`$`,
+)
+
+type Email string
+
+func (e Email) IsValid() bool {
+	return emailAddressMatcher.MatchString(string(e))
+}
+
+func (e Email) String() string {
+	return string(e)
+}
+
+func (e Email) ToLower() Email {
+	return Email(strings.TrimSpace(strings.ToLower(string(e))))
+}
diff --git a/model/email_test.go b/model/email_test.go
new file mode 100644
index 0000000..c45a2f0
--- /dev/null
+++ b/model/email_test.go
@@ -0,0 +1,31 @@
+package model_test
+
+import (
+	"testing"
+
+	"maragu.dev/is"
+
+	"maragu.dev/goo/model"
+)
+
+func TestEmail_IsValid(t *testing.T) {
+	tests := []struct {
+		address string
+		valid   bool
+	}{
+		{"me@example.com", true},
+		{"@example.com", false},
+		{"me@", false},
+		{"@", false},
+		{"", false},
+		{"me@example", false},
+	}
+	t.Run("reports valid email addresses", func(t *testing.T) {
+		for _, test := range tests {
+			t.Run(test.address, func(t *testing.T) {
+				e := model.Email(test.address)
+				is.Equal(t, test.valid, e.IsValid())
+			})
+		}
+	})
+}
diff --git a/model/model.go b/model/model.go
new file mode 100644
index 0000000..183f1a3
--- /dev/null
+++ b/model/model.go
@@ -0,0 +1,7 @@
+package model
+
+type ID string
+
+func (i ID) String() string {
+	return string(i)
+}
diff --git a/model/time.go b/model/time.go
new file mode 100644
index 0000000..2ec775f
--- /dev/null
+++ b/model/time.go
@@ -0,0 +1,60 @@
+package model
+
+import (
+	"database/sql/driver"
+	"fmt"
+	"time"
+)
+
+// rfc3339Milli is like time.RFC3339Nano, but with millisecond precision, and fractional seconds do not have trailing
+// zeros removed.
+const rfc3339Milli = "2006-01-02T15:04:05.000Z07:00"
+
+type Time struct {
+	T time.Time
+}
+
+func (t *Time) String() string {
+	if t == nil {
+		return ""
+	}
+	return t.T.UTC().Format(rfc3339Milli)
+}
+
+func ParseTime(v string) (Time, error) {
+	t, err := time.Parse(rfc3339Milli, v)
+	if err != nil {
+		return Time{}, err
+	}
+	return Time{T: t}, nil
+}
+
+// Value satisfies driver.Valuer interface.
+func (t Time) Value() (driver.Value, error) {
+	return t.T.UTC().Format(rfc3339Milli), nil
+}
+
+// Scan satisfies sql.Scanner interface.
+func (t *Time) Scan(src any) error {
+	if src == nil {
+		return nil
+	}
+
+	s, ok := src.(string)
+	if !ok {
+		return fmt.Errorf("error scanning time, got %+v", src)
+	}
+
+	parsedT, err := time.Parse(rfc3339Milli, s)
+	if err != nil {
+		return err
+	}
+
+	t.T = parsedT.UTC()
+
+	return nil
+}
+
+func Now() *Time {
+	return &Time{T: time.Now()}
+}