You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: caste.go
    path of file: ./repos/minicron/client/vendor/github.com/spf13/cast
    
    the code of the file until where you have to start completion: // Copyright © 2014 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.

package cast

import (
	"errors"
	"fmt"
	"html/template"
	"reflect"
	"strconv"
	"strings"
	"time"
)

var errNegativeNotAllowed = errors.New("unable to cast negative value")

// ToTimeE casts an interface to a time.Time type.
func ToTimeE(i interface{}) (tim time.Time, err error) {
	i = indirect(i)

	switch v := i.(type) {
	case time.Time:
		return v, nil
	case string:
		return StringToDate(v)
	case int:
		return time.U
    
func ToStringE(i interface{}) (string, error) {
	i = indirectToStringerOrError(i)

	switch s := i.(type) {
	case string:
		return s, nil
	case bool:
		return strconv.FormatBool(s), nil
	case float64:
		return strconv.FormatFloat(s, 'f', -1, 64), nil
	case float32:
		return strconv.FormatFloat(float64(s), 'f', -1, 32), nil
	case int:
		return strconv.Itoa(s), nil
	case int64:
		return strconv.FormatInt(s, 10), nil
	case int32:
		return strconv.Itoa(int(s)), nil
	case int16:
		return strconv.FormatInt(int64(s), 10), nil
	case int8:
		return strconv.FormatInt(int64(s), 10), nil
	case uint:
		return strconv.FormatInt(int64(s), 10), nil
	case uint64:
		return strconv.FormatInt(int64(s), 10), nil
	case uint32:
		return strconv.FormatInt(int64(s), 10), nil
	case uint16:
		return strconv.FormatInt(int64(s), 10), nil
	case uint8:
		return strconv.FormatInt(int64(s), 10), nil
	case []byte:
		return string(s), nil
	case template.HTML:
		return string(s), nil
	case template.URL:
		return string(s), nil
	case template.JS:
		return string(s), nil
	case template.CSS:
		return string(s), nil
	case template.HTMLAttr:
		return string(s), nil
	case nil:
		return "", nil
	case fmt.Stringer:
		return s.String(), nil
	case error:
		return s.Error(), nil
	default:
		return "", fmt.Errorf("unable to cast %#v of type %T to string", i, i)
	}
}