dateparse

package module
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 Go to latest Published: Sep 12, 2019 License: MIT Imports: 6 Imported by: 0

README

Go Date Parser

Parse many date strings without knowing format in advance. Uses a scanner to read bytes and use a state machine to find format. Much faster than shotgun based parse methods. See bench_test.go for performance comparison.

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MM/DD/YYYY VS DD/MM/YYYY Right now this uses mm/dd/yyyy WHEN ambiguous if this is not desired behavior, use ParseStrict which will fail on ambiguous date strings.

Timezones The location your server is configured affects the results! See example or https://play.golang.org/p/IDHRalIyXh and last paragraph here https://golang.org/pkg/time/#Parse.


// Normal parse.  Equivalent Timezone rules as time.Parse()
t, err := dateparse.ParseAny("3/1/2014")

// Parse Strict, error on ambigous mm/dd vs dd/mm dates
t, err := dateparse.ParseStrict("3/1/2014")
> returns error 

// Return a string that represents the layout to parse the given date-time.
layout, err := dateparse.ParseFormat("May 8, 2009 5:57:51 PM")
> "Jan 2, 2006 3:04:05 PM"

cli tool for testing dateformats

Date Parse CLI

Extended example

https://github.com/araddon/dateparse/blob/master/example/main.go

package main

import (
	"flag"
	"fmt"
	"time"

	"github.com/apcera/termtables"
	"github.com/araddon/dateparse"
)

var examples = []string{
	"May 8, 2009 5:57:51 PM",
	"oct 7, 1970",
	"oct 7, '70",
	"oct. 7, 1970",
	"oct. 7, 70",
	"Mon Jan  2 15:04:05 2006",
	"Mon Jan  2 15:04:05 MST 2006",
	"Mon Jan 02 15:04:05 -0700 2006",
	"Monday, 02-Jan-06 15:04:05 MST",
	"Mon, 02 Jan 2006 15:04:05 MST",
	"Tue, 11 Jul 2017 16:28:13 +0200 (CEST)",
	"Mon, 02 Jan 2006 15:04:05 -0700",
	"Thu, 4 Jan 2018 17:53:36 +0000",
	"Mon Aug 10 15:44:11 UTC+0100 2015",
	"Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time)",
	"September 17, 2012 10:09am",
	"September 17, 2012 at 10:09am PST-08",
	"September 17, 2012, 10:10:09",
	"October 7, 1970",
	"October 7th, 1970",
	"12 Feb 2006, 19:17",
	"12 Feb 2006 19:17",
	"7 oct 70",
	"7 oct 1970",
	"03 February 2013",
	"1 July 2013",
	"2013-Feb-03",
	//   mm/dd/yy
	"3/31/2014",
	"03/31/2014",
	"08/21/71",
	"8/1/71",
	"4/8/2014 22:05",
	"04/08/2014 22:05",
	"4/8/14 22:05",
	"04/2/2014 03:00:51",
	"8/8/1965 12:00:00 AM",
	"8/8/1965 01:00:01 PM",
	"8/8/1965 01:00 PM",
	"8/8/1965 1:00 PM",
	"8/8/1965 12:00 AM",
	"4/02/2014 03:00:51",
	"03/19/2012 10:11:59",
	"03/19/2012 10:11:59.3186369",
	// yyyy/mm/dd
	"2014/3/31",
	"2014/03/31",
	"2014/4/8 22:05",
	"2014/04/08 22:05",
	"2014/04/2 03:00:51",
	"2014/4/02 03:00:51",
	"2012/03/19 10:11:59",
	"2012/03/19 10:11:59.3186369",
	// Chinese
	"2014年04月08日",
	//   yyyy-mm-ddThh
	"2006-01-02T15:04:05+0000",
	"2009-08-12T22:15:09-07:00",
	"2009-08-12T22:15:09",
	"2009-08-12T22:15:09Z",
	//   yyyy-mm-dd hh:mm:ss
	"2014-04-26 17:24:37.3186369",
	"2012-08-03 18:31:59.257000000",
	"2014-04-26 17:24:37.123",
	"2013-04-01 22:43",
	"2013-04-01 22:43:22",
	"2014-12-16 06:20:00 UTC",
	"2014-12-16 06:20:00 GMT",
	"2014-04-26 05:24:37 PM",
	"2014-04-26 13:13:43 +0800",
	"2014-04-26 13:13:43 +0800 +08",
	"2014-04-26 13:13:44 +09:00",
	"2012-08-03 18:31:59.257000000 +0000 UTC",
	"2015-09-30 18:48:56.35272715 +0000 UTC",
	"2015-02-18 00:12:00 +0000 GMT",
	"2015-02-18 00:12:00 +0000 UTC",
	"2015-02-08 03:02:00 +0300 MSK m=+0.000000001",
	"2015-02-08 03:02:00.001 +0300 MSK m=+0.000000001",
	"2017-07-19 03:21:51+00:00",
	"2014-04-26",
	"2014-04",
	"2014",
	"2014-05-11 08:20:13,787",
	// mm.dd.yy
	"3.31.2014",
	"03.31.2014",
	"08.21.71",
	"2014.03",
	"2014.03.30",
	//  yyyymmdd and similar
	"20140601",
	"20140722105203",
	// unix seconds, ms, micro, nano
	"1332151919",
	"1384216367189",
	"1384216367111222",
	"1384216367111222333",
}

var (
	timezone = ""
)

func main() {
	flag.StringVar(&timezone, "timezone", "UTC", "Timezone aka `America/Los_Angeles` formatted time-zone")
	flag.Parse()

	if timezone != "" {
		// NOTE:  This is very, very important to understand
		// time-parsing in go
		loc, err := time.LoadLocation(timezone)
		if err != nil {
			panic(err.Error())
		}
		time.Local = loc
	}

	table := termtables.CreateTable()

	table.AddHeaders("Input", "Parsed, and Output as %v")
	for _, dateExample := range examples {
		t, err := dateparse.ParseLocal(dateExample)
		if err != nil {
			panic(err.Error())
		}
		table.AddRow(dateExample, fmt.Sprintf("%v", t))
	}
	fmt.Println(table.Render())
}

/*
+-------------------------------------------------------+-----------------------------------------+
| Input                                                 | Parsed, and Output as %v                |
+-------------------------------------------------------+-----------------------------------------+
| May 8, 2009 5:57:51 PM                                | 2009-05-08 17:57:51 +0000 UTC           |
| oct 7, 1970                                           | 1970-10-07 00:00:00 +0000 UTC           |
| oct 7, '70                                            | 1970-10-07 00:00:00 +0000 UTC           |
| oct. 7, 1970                                          | 1970-10-07 00:00:00 +0000 UTC           |
| oct. 7, 70                                            | 1970-10-07 00:00:00 +0000 UTC           |
| Mon Jan  2 15:04:05 2006                              | 2006-01-02 15:04:05 +0000 UTC           |
| Mon Jan  2 15:04:05 MST 2006                          | 2006-01-02 15:04:05 +0000 MST           |
| Mon Jan 02 15:04:05 -0700 2006                        | 2006-01-02 15:04:05 -0700 -0700         |
| Monday, 02-Jan-06 15:04:05 MST                        | 2006-01-02 15:04:05 +0000 MST           |
| Mon, 02 Jan 2006 15:04:05 MST                         | 2006-01-02 15:04:05 +0000 MST           |
| Tue, 11 Jul 2017 16:28:13 +0200 (CEST)                | 2017-07-11 16:28:13 +0200 +0200         |
| Mon, 02 Jan 2006 15:04:05 -0700                       | 2006-01-02 15:04:05 -0700 -0700         |
| Thu, 4 Jan 2018 17:53:36 +0000                        | 2018-01-04 17:53:36 +0000 UTC           |
| Mon Aug 10 15:44:11 UTC+0100 2015                     | 2015-08-10 15:44:11 +0000 UTC           |
| Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) | 2015-07-03 18:04:07 +0100 GMT           |
| September 17, 2012 10:09am                            | 2012-09-17 10:09:00 +0000 UTC           |
| September 17, 2012 at 10:09am PST-08                  | 2012-09-17 10:09:00 -0800 PST           |
| September 17, 2012, 10:10:09                          | 2012-09-17 10:10:09 +0000 UTC           |
| October 7, 1970                                       | 1970-10-07 00:00:00 +0000 UTC           |
| October 7th, 1970                                     | 1970-10-07 00:00:00 +0000 UTC           |
| 12 Feb 2006, 19:17                                    | 2006-02-12 19:17:00 +0000 UTC           |
| 12 Feb 2006 19:17                                     | 2006-02-12 19:17:00 +0000 UTC           |
| 7 oct 70                                              | 1970-10-07 00:00:00 +0000 UTC           |
| 7 oct 1970                                            | 1970-10-07 00:00:00 +0000 UTC           |
| 03 February 2013                                      | 2013-02-03 00:00:00 +0000 UTC           |
| 1 July 2013                                           | 2013-07-01 00:00:00 +0000 UTC           |
| 2013-Feb-03                                           | 2013-02-03 00:00:00 +0000 UTC           |
| 3/31/2014                                             | 2014-03-31 00:00:00 +0000 UTC           |
| 03/31/2014                                            | 2014-03-31 00:00:00 +0000 UTC           |
| 08/21/71                                              | 1971-08-21 00:00:00 +0000 UTC           |
| 8/1/71                                                | 1971-08-01 00:00:00 +0000 UTC           |
| 4/8/2014 22:05                                        | 2014-04-08 22:05:00 +0000 UTC           |
| 04/08/2014 22:05                                      | 2014-04-08 22:05:00 +0000 UTC           |
| 4/8/14 22:05                                          | 2014-04-08 22:05:00 +0000 UTC           |
| 04/2/2014 03:00:51                                    | 2014-04-02 03:00:51 +0000 UTC           |
| 8/8/1965 12:00:00 AM                                  | 1965-08-08 00:00:00 +0000 UTC           |
| 8/8/1965 01:00:01 PM                                  | 1965-08-08 13:00:01 +0000 UTC           |
| 8/8/1965 01:00 PM                                     | 1965-08-08 13:00:00 +0000 UTC           |
| 8/8/1965 1:00 PM                                      | 1965-08-08 13:00:00 +0000 UTC           |
| 8/8/1965 12:00 AM                                     | 1965-08-08 00:00:00 +0000 UTC           |
| 4/02/2014 03:00:51                                    | 2014-04-02 03:00:51 +0000 UTC           |
| 03/19/2012 10:11:59                                   | 2012-03-19 10:11:59 +0000 UTC           |
| 03/19/2012 10:11:59.3186369                           | 2012-03-19 10:11:59.3186369 +0000 UTC   |
| 2014/3/31                                             | 2014-03-31 00:00:00 +0000 UTC           |
| 2014/03/31                                            | 2014-03-31 00:00:00 +0000 UTC           |
| 2014/4/8 22:05                                        | 2014-04-08 22:05:00 +0000 UTC           |
| 2014/04/08 22:05                                      | 2014-04-08 22:05:00 +0000 UTC           |
| 2014/04/2 03:00:51                                    | 2014-04-02 03:00:51 +0000 UTC           |
| 2014/4/02 03:00:51                                    | 2014-04-02 03:00:51 +0000 UTC           |
| 2012/03/19 10:11:59                                   | 2012-03-19 10:11:59 +0000 UTC           |
| 2012/03/19 10:11:59.3186369                           | 2012-03-19 10:11:59.3186369 +0000 UTC   |
| 2014年04月08日                                           | 2014-04-08 00:00:00 +0000 UTC           |
| 2006-01-02T15:04:05+0000                              | 2006-01-02 15:04:05 +0000 UTC           |
| 2009-08-12T22:15:09-07:00                             | 2009-08-12 22:15:09 -0700 -0700         |
| 2009-08-12T22:15:09                                   | 2009-08-12 22:15:09 +0000 UTC           |
| 2009-08-12T22:15:09Z                                  | 2009-08-12 22:15:09 +0000 UTC           |
| 2014-04-26 17:24:37.3186369                           | 2014-04-26 17:24:37.3186369 +0000 UTC   |
| 2012-08-03 18:31:59.257000000                         | 2012-08-03 18:31:59.257 +0000 UTC       |
| 2014-04-26 17:24:37.123                               | 2014-04-26 17:24:37.123 +0000 UTC       |
| 2013-04-01 22:43                                      | 2013-04-01 22:43:00 +0000 UTC           |
| 2013-04-01 22:43:22                                   | 2013-04-01 22:43:22 +0000 UTC           |
| 2014-12-16 06:20:00 UTC                               | 2014-12-16 06:20:00 +0000 UTC           |
| 2014-12-16 06:20:00 GMT                               | 2014-12-16 06:20:00 +0000 UTC           |
| 2014-04-26 05:24:37 PM                                | 2014-04-26 17:24:37 +0000 UTC           |
| 2014-04-26 13:13:43 +0800                             | 2014-04-26 13:13:43 +0800 +0800         |
| 2014-04-26 13:13:43 +0800 +08                         | 2014-04-26 13:13:43 +0800 +0800         |
| 2014-04-26 13:13:44 +09:00                            | 2014-04-26 13:13:44 +0900 +0900         |
| 2012-08-03 18:31:59.257000000 +0000 UTC               | 2012-08-03 18:31:59.257 +0000 UTC       |
| 2015-09-30 18:48:56.35272715 +0000 UTC                | 2015-09-30 18:48:56.35272715 +0000 UTC  |
| 2015-02-18 00:12:00 +0000 GMT                         | 2015-02-18 00:12:00 +0000 UTC           |
| 2015-02-18 00:12:00 +0000 UTC                         | 2015-02-18 00:12:00 +0000 UTC           |
| 2015-02-08 03:02:00 +0300 MSK m=+0.000000001          | 2015-02-08 03:02:00 +0300 +0300         |
| 2015-02-08 03:02:00.001 +0300 MSK m=+0.000000001      | 2015-02-08 03:02:00.001 +0300 +0300     |
| 2017-07-19 03:21:51+00:00                             | 2017-07-19 03:21:51 +0000 UTC           |
| 2014-04-26                                            | 2014-04-26 00:00:00 +0000 UTC           |
| 2014-04                                               | 2014-04-01 00:00:00 +0000 UTC           |
| 2014                                                  | 2014-01-01 00:00:00 +0000 UTC           |
| 2014-05-11 08:20:13,787                               | 2014-05-11 08:20:13.787 +0000 UTC       |
| 3.31.2014                                             | 2014-03-31 00:00:00 +0000 UTC           |
| 03.31.2014                                            | 2014-03-31 00:00:00 +0000 UTC           |
| 08.21.71                                              | 1971-08-21 00:00:00 +0000 UTC           |
| 2014.03                                               | 2014-03-01 00:00:00 +0000 UTC           |
| 2014.03.30                                            | 2014-03-30 00:00:00 +0000 UTC           |
| 20140601                                              | 2014-06-01 00:00:00 +0000 UTC           |
| 20140722105203                                        | 2014-07-22 10:52:03 +0000 UTC           |
| 1332151919                                            | 2012-03-19 10:11:59 +0000 UTC           |
| 1384216367189                                         | 2013-11-12 00:32:47.189 +0000 UTC       |
| 1384216367111222                                      | 2013-11-12 00:32:47.111222 +0000 UTC    |
| 1384216367111222333                                   | 2013-11-12 00:32:47.111222333 +0000 UTC |
+-------------------------------------------------------+-----------------------------------------+
*/

Documentation

Overview

Package dateparse parses date-strings without knowing the format in advance, using a fast lex based approach to eliminate shotgun attempts. It leans towards US style dates when there is a conflict.

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrAmbiguousMMDD for date formats such as 04/02/2014 the mm/dd vs dd/mm are
	// ambiguous, so it is an error for strict parse rules.
	ErrAmbiguousMMDD = fmt.Errorf("This date has ambiguous mm/dd vs dd/mm type format")
)

Functions

func MustParse 

func MustParse(datestr string, preferMonthFirst bool) time.Time

MustParse parse a date, and panic if it can't be parsed. Used for testing. Not recommended for most use-cases.

func ParseAny 

func ParseAny(datestr string, preferMonthFirst bool) (time.Time, error)

ParseAny parse an unknown date format, detect the layout. Normal parse. Equivalent Timezone rules as time.Parse(). NOTE: please see readme on mmdd vs ddmm ambiguous dates.

func ParseFormat 

func ParseFormat(datestr string, preferMonthFirst bool) (string, error)

ParseFormat parse's an unknown date-time string and returns a layout string that can parse this (and exact same format) other date-time strings. 

layout, err := dateparse.ParseFormat("2013-02-01 00:00:00")
// layout = "2006-01-02 15:04:05"

func ParseIn 

func ParseIn(datestr string, loc *time.Location, preferMonthFirst bool) (time.Time, error)

ParseIn with Location, equivalent to time.ParseInLocation() timezone/offset rules. Using location arg, if timezone/offset info exists in the datestring, it uses the given location rules for any zone interpretation. That is, MST means one thing when using America/Denver and something else in other locations.

func ParseLocal 

func ParseLocal(datestr string, preferMonthFirst bool) (time.Time, error)

ParseLocal Given an unknown date format, detect the layout, using time.Local, parse.

Set Location to time.Local. Same as ParseIn Location but lazily uses the global time.Local variable for Location argument. 

denverLoc, _ := time.LoadLocation("America/Denver")
time.Local = denverLoc

t, err := dateparse.ParseLocal("3/1/2014")

Equivalent to: 

t, err := dateparse.ParseIn("3/1/2014", denverLoc)

func ParseStrict 

func ParseStrict(datestr string, preferMonthFirst bool) (time.Time, error)

ParseStrict parse an unknown date format. IF the date is ambigous mm/dd vs dd/mm then return an error. These return errors: 3.3.2014 , 8/8/71 etc

Types

This section is empty.

Source Files

View all Source files

Directories

Path Synopsis

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