In this article, we will explore the http ParseTime function in Go net/http package in detail, along with examples.
The http ParseTime function parses a time string in the HTTP/1.1 format and returns a time.Time value.
syntax
func ParseTime(text string) (t time.Time, err error)
The ParseTime function takes a single argument:
- text: A string representing a date-time value in the HTTP/1.1 format (e.g., “Sun, 06 Nov 1994 08:49:37 GMT”).
The function returns two values:
- t: A time.Time value representing the parsed date-time value.
- err: An error value indicating whether the parsing was successful. It returns nil if the parsing was successful, and an error otherwise.
The http.ParseTime function supports parsing date-time strings in three standard formats specified by the HTTP/1.1 protocol:
- RFC 1123: “Mon, 02 Jan 2006 15:04:05 GMT”
- RFC 850: “Monday, 02-Jan-06 15:04:05 GMT”
- ANSI C’s asctime(): “Mon Jan _2 15:04:05 2006”
Example Usage
Let’s demonstrate with a simple example.
package main
import (
"fmt"
"net/http"
)
func main() {
httpTimeString := "Sun, 06 Nov 1994 08:49:37 GMT"
t, err := http.ParseTime(httpTimeString)
if err == nil {
fmt.Printf("Parsed time: %s\n", t)
} else {
fmt.Println("Error parsing HTTP time:", err)
}
}
In this example, we define an HTTP date-time string “Sun, 06 Nov 1994 08:49:37 GMT” and use the ParseTime function to parse it. If the parsing is successful, the parsed time is printed; otherwise, an error message is displayed.
Output:
Parsed time: 1994-11-06 08:49:37 +0000 UTC
Handling Invalid HTTP Time Strings
If the provided time string is not in a valid HTTP/1.1 format, then it returns an error. Let’s look at an example to see how this works.
package main
import (
"fmt"
"net/http"
)
func main() {
httpTimeString := "InvalidTime"
t, err := http.ParseTime(httpTimeString)
if err == nil {
fmt.Printf("Parsed time: %s\n", t)
} else {
fmt.Println("Error parsing HTTP time:", err)
}
}
In this case, since the provided string “InvalidTime” is not a valid HTTP time format, the function returns an error, and the “Error parsing HTTP time” message is displayed.
Output:
Error parsing HTTP time: parsing time "InvalidTime" as "Mon Jan _2 15:04:05 2006": cannot parse "InvalidTime" as "Mon"
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