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Published: Jun 12, 2020 License: MIT Imports: 4 Imported by: 66


A fast ISO8601 date parser for Go reference GoDoc Build Status Go Report Card

go get

The built-in RFC3333 time layout in Go is too restrictive to support any ISO8601 date-time.

This library parses any ISO8601 date into a native Go time object without regular expressions.


import ""

// iso8601.Time can be used as a drop-in replacement for time.Time with JSON responses
type ExternalAPIResponse struct {
	Timestamp *iso8601.Time

func main() {
	// iso8601.ParseString can also be called directly
	t, err := iso8601.ParseString("2020-01-02T16:20:00")


BenchmarkParse-16        	13364954	        77.7 ns/op	       0 B/op	       0 allocs/op



Package iso8601 is a utility for parsing ISO8601 datetime strings into native Go times. The standard library's RFC3339 reference layout can be too strict for working with 3rd party APIs, especially ones written in other languages.

Use the provided `Time` structure instead of the default `time.Time` to provide ISO8601 support for JSON responses.



This section is empty.


View Source
var (
	// ErrZoneCharacters indicates an incorrect amount of characters was passed to ParseISOZone.
	ErrZoneCharacters = errors.New("iso8601: Expected between 3 and 6 characters for zone information")

	// ErrInvalidZone indicates an invalid timezone per the standard that doesn't violate any specific
	// character parsing rules.
	ErrInvalidZone = errors.New("iso8601: Specified zone is invalid")

	// ErrRemainingData indicates that there is extra data after a `Z` character.
	ErrRemainingData = errors.New("iso8601: Unexepected remaining data after `Z`")

	// ErrNotString indicates that a non string type was passed to the UnmarshalJSON method of `Time`.
	ErrNotString = errors.New("iso8601: Invalid json type (expected string)")

	// ErrPrecision indicates that there was too much precision (characters) given to parse
	// for the fraction of a second of the input time.
	ErrPrecision = errors.New("iso8601: Too many characters in fraction of second precision")


func Parse

func Parse(inp []byte) (time.Time, error)

Parse parses an ISO8601 compliant date-time byte slice into a time.Time object.

func ParseISOZone

func ParseISOZone(inp []byte) (*time.Location, error)

ParseISOZone parses the 5 character zone information in an ISO8061 date string. This function expects input that matches:


func ParseString

func ParseString(inp string) (time.Time, error)

ParseString parses an ISO8601 compliant date-time string into a time.Time object.


type Time

type Time struct {

Time is a helper object for parsing ISO8061 dates as a JSON string.

func (*Time) UnmarshalJSON

func (t *Time) UnmarshalJSON(b []byte) error

UnmarshalJSON decodes a JSON string or null into a iso8601 time

type UnexpectedCharacterError

type UnexpectedCharacterError struct {
	Character byte

UnexpectedCharacterError indicates the parser scanned a character that was not expected at that time.

func (*UnexpectedCharacterError) Error

func (e *UnexpectedCharacterError) Error() string

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