Golang : Convert date string to variants of time.Time type examples
Here are few examples on how to convert a given date of string type to equivalent time.Time
type. Most newbies have difficulty in converting a given date of type string into time.Time
type and preserve(or change) the original format at the end of the conversion.
time.Parse()
function that most Golang developers use to convert a string into time.Time
type will pad the output with extra information such as timezone, minutes and second that some developers do not want in the final result. Instead of breaking the year, day and month out and recombine them again, this can be solved easily with the time.Format()
function.
1.Convert date string "2016-09-01"
package main
import (
"fmt"
"os"
"time"
)
func main() {
dateString := "2016-09-01"
fmt.Printf("Input : %s\n", dateString)
//convert string to time.Time type
layOut := "2006-01-02"
dateStamp, err := time.Parse(layOut, dateString)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// we want same format as the dateString
// but time.Parse function provides extra information such as time zone, minutes
// that we don't need.
fmt.Printf("Output(local date) : %s\n", dateStamp.Local())
fmt.Printf("Output(UTC) : %s\n", dateStamp)
// additional step to format it as input
convertedDateString := dateStamp.Format(layOut)
fmt.Printf("Final output : %s\n", convertedDateString)
}
Output:
Input : 2016-09-01
Output(local date) : 2016-09-01 08:00:00 +0800 SGT
Output(UTC) : 2016-09-01 00:00:00 +0000 UTC
Final output : 2016-09-01
2.Convert date string "2016-09-01" to "dd-MMM-yyyy" or "1-Sep-2016" or "1-September-2016"
package main
import (
"fmt"
"os"
"time"
)
func main() {
dateString := "2016-09-01"
fmt.Printf("Input : %s\n", dateString)
//convert string to time.Time type
layOut := "2006-01-02" // yyyy-dd-MM
dateStamp, err := time.Parse(layOut, dateString)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// we want same format as the dateString
// but time.Parse function provides extra information such as time zone, minutes
// that we don't need.
fmt.Printf("Output(local date) : %s\n", dateStamp.Local())
fmt.Printf("Output(UTC) : %s\n", dateStamp)
// additional step to format to dd-MMM-yyyy
convertedDateString := dateStamp.Format("2-Jan-2006")
fmt.Printf("Output : %s\n", convertedDateString)
// or if you prefer the full month name
fmt.Printf("Full output : %s\n", dateStamp.Format("2-January-2006"))
}
Input : 2016-09-01
Output(local date) : 2016-09-01 08:00:00 +0800 SGT
Output(UTC) : 2016-09-01 00:00:00 +0000 UTC
Output : 1-Sep-2016
Full output : 1-September-2016
3.Convert date string "2016-09-01" to "E, MMM d yyyy"
package main
import (
"fmt"
"os"
"time"
)
func main() {
dateString := "2016-09-01"
fmt.Printf("Input : %s\n", dateString)
//convert string to time.Time type
layOut := "2006-01-02" // yyyy-dd-MM
dateStamp, err := time.Parse(layOut, dateString)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// format to E, MMM d yyyy
convertedDateString := dateStamp.Format("Mon 2-Jan-2006")
fmt.Printf("Output : %s\n", convertedDateString)
fmt.Printf("Full output : %s\n", dateStamp.Format("Monday 2-January-2006"))
}
Input : 2016-09-01
Output : Thu 1-Sep-2016
Full output : Thursday 1-September-2016
Hope this helps!
References:
https://www.socketloop.com/tutorials/golang-change-date-format-to-yyyy-mm-dd
https://golang.org/pkg/time/#example_Month
https://www.socketloop.com/tutorials/golang-date-and-time-formatting
See also : Golang : Convert date or time stamp from string to time.Time type
By Adam Ng
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