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json_time.go
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json_time.go
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package utils
import (
"database/sql/driver"
"encoding/json"
"fmt"
"time"
)
const TimeLayout = "2006-01-02 15:04:05"
const DefaultTimeZone = "Asia/Shanghai"
func ParseWithLocation(locationName string, timeStr string) (time.Time, error) {
if l, err := time.LoadLocation(locationName); err != nil {
return time.Time{}, err
} else {
lt, _ := time.ParseInLocation(TimeLayout, timeStr, l)
return lt, nil
}
}
// JSONTime format json time field by myself
type JSONTime struct {
time.Time
}
func NewJSONTimeFromString(t string) (JSONTime, error) {
if lt, err := ParseWithLocation(DefaultTimeZone, t); err != nil {
return JSONTime{}, err
} else {
return NewJSONTimeFromTime(lt), nil
}
}
func NewJSONTimeFromTime(time time.Time) JSONTime {
t := JSONTime{time}
return t
}
// MarshalJSON on JSONTime format Time field with %Y-%m-%d %H:%M:%S
func (t JSONTime) MarshalJSON() ([]byte, error) {
return json.Marshal(t.FormatTime())
}
func (t *JSONTime) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
if t1, err := NewJSONTimeFromString(s); err != nil {
return err
} else {
*t = t1
}
return nil
}
func (t JSONTime) FormatTime() string {
return fmt.Sprintf("%s", t.Format(TimeLayout))
}
// Value insert timestamp into mysql need this function.
func (t JSONTime) Value() (driver.Value, error) {
if t.Time.IsZero() {
return nil, nil
}
return t.Time, nil
}
// Scan value of time.Time
func (t *JSONTime) Scan(v interface{}) error {
value, ok := v.(time.Time)
if ok {
*t = JSONTime{Time: value}
return nil
}
return fmt.Errorf("can not convert %v to timestamp", v)
}