I encounter the below error when I want to parse such string to struct.
parsing time “”"" as ““2006-01-02T15:04:05Z07:00"”: cannot parse “”” as "2006"
package main
import (
"fmt"
"time"
"encoding/json"
)
func main() {
s :=`[
{"name":"test1","expireAt":"2050-12-31T00:00:00Z"},
{"name":"test2","expireAt":""}
]`
var result []struct{
Name string
ExpireAt time.Time
}
err :=json.Unmarshal([]byte(s),&result)
if err!=nil{
fmt.Println(err)
}
for _,v :=range result{
fmt.Println(v.ExpireAt)
}
}
Output:
parsing time """" as ""2006-01-02T15:04:05Z07:00"": cannot parse """ as "2006" 2050-12-31 00:00:00 +0000 UTC 0001-01-01 00:00:00 +0000 UTC
Solution:
package main
import (
"fmt"
"time"
"encoding/json"
)
type MyTime time.Time
func (m *MyTime) UnmarshalJSON(data []byte) error {
if string(data) == "null" || string(data) == `""` {
return nil
}
return json.Unmarshal(data, (*time.Time)(m))
}
func main() {
s :=`[
{"name":"test1","expireAt":"2050-12-31T00:00:00Z"},
{"name":"test2","expireAt":""}
]`
var result []struct{
Name string
ExpireAt MyTime
}
err :=json.Unmarshal([]byte(s),&result)
if err!=nil{
fmt.Println(err)
}
for _,v :=range result{
fmt.Println(time.Time(v.ExpireAt))
}
}
Output:
2050-12-31 00:00:00 +0000 UTC 0001-01-01 00:00:00 +0000 UTC
BTW, there is one more point that I hope to get you guy’s attention. The point is that it can work fine if we ignore the error when we unmarshal the string to the struct.
For example:
package main
import (
"encoding/json"
"fmt"
"time"
)
func main() {
s := `[
{"name":"test1","expireAt":"2050-12-31T00:00:00Z"},
{"name":"test2"}
]`
var result []struct {
Name string
ExpireAt time.Time
}
_ = json.Unmarshal([]byte(s), &result)
for _, v := range result {
fmt.Println(v.ExpireAt)
}
}
Output
2050-12-31 00:00:00 +0000 UTC 0001-01-01 00:00:00 +0000 UTC
