package main

import (
        "fmt"
        "time"

        "github.com/go-openapi/strfmt"
        "gopkg.in/yaml.v3"
)

type S struct {
        Name    string          `yaml:"name"`
        Created strfmt.DateTime `yaml:"created,omitempty"`
}

func main() {
        s := S{
                Name:    "test",
                Created: strfmt.DateTime(time.Now()),
        }
        marshalled, err := yaml.Marshal(s)
        if err != nil {
                panic(err)
        }

        fmt.Println(string(marshalled))
}