/
date_from_int.go
77 lines (66 loc) · 1.36 KB
/
date_from_int.go
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package jsontostruct
import (
"database/sql/driver"
"errors"
"fmt"
"strconv"
"time"
)
type DateFromInt time.Time
func (i DateFromInt) MarshalJSON() ([]byte, error) {
return []byte(time.Time(i).Format("20060102")), nil
}
func (i *DateFromInt) UnmarshalJSON(data []byte) error {
dataStr := string(data)
value, err := strconv.Atoi(dataStr)
if err != nil {
return err
}
layout := "20060102"
date, err := time.Parse(layout, fmt.Sprintf("%d", value))
if err != nil {
return err
}
*i = DateFromInt(date)
return nil
}
func (i *DateFromInt) Scan(value interface{}) error {
layout := "20060102"
switch t := value.(type) {
case string:
date, err := time.Parse(time.RFC3339, t)
if err != nil {
date, err = time.Parse(layout, t)
if err != nil {
return err
}
}
*i = DateFromInt(date)
case time.Time:
*i = DateFromInt(t)
case *string:
if t != nil {
date, err := time.Parse(time.RFC3339, *t)
if err != nil {
date, err = time.Parse(layout, *t)
if err != nil {
return err
}
}
*i = DateFromInt(date)
}
case *time.Time:
if t != nil {
*i = DateFromInt(*t)
}
default:
return errors.New(fmt.Sprint("failed to unmarshal IntToDate value:", value))
}
return nil
}
func (i DateFromInt) Value() (driver.Value, error) {
if time.Time(i).IsZero() {
return nil, nil
}
return time.Time(i).Format(time.RFC3339), nil
}