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abacbd8024
dateparse/parseany.go
Aaron Raddon abacbd8024 add another weird date format: 08/21/71
2014-12-15 11:20:40 -08:00

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package dateparse
import (
"fmt"
u "github.com/araddon/gou"
"strconv"
"time"
"unicode"
"unicode/utf8"
)
type DateState int
const (
ST_START DateState = iota
ST_DIGIT
ST_DIGITDASH
ST_DIGITDASHWS
ST_DIGITDASHWSALPHA
ST_DIGITDASHT
ST_DIGITCOMMA
ST_DIGITCOLON
ST_DIGITSLASH
ST_DIGITSLASHWS
ST_DIGITSLASHWSCOLON
ST_DIGITSLASHWSCOLONCOLON
ST_ALPHA
ST_ALPHAWS
ST_ALPHAWSCOMMA
ST_ALPHAWSALPHA
ST_ALPHACOMMA
ST_ALPHACOMMADASH
ST_ALPHACOMMADASHDASH
//ST_ALPHADIGIT
)
var _ = u.EMPTY
var (
shortDates = []string{"01/02/2006", "1/2/2006", "06/01/02", "01/02/06"}
)
// Given an unknown date format, detect the type, parse, return time
func ParseAny(datestr string) (time.Time, error) {
state := ST_START
firstSlash := 0
// General strategy is to read rune by rune through the date looking for
// certain hints of what type of date we are dealing with.
// Hopefully we only need to read about 5 or 6 bytes before
// we figure it out and then attempt a parse
iterRunes:
for i := 0; i < len(datestr); i++ {
r, bytesConsumed := utf8.DecodeRuneInString(datestr[i:])
if bytesConsumed > 1 {
i += (bytesConsumed - 1)
}
//u.Infof("char=%s i=%d datestr=%s", r, i, datestr)
switch state {
case ST_START:
if unicode.IsDigit(r) {
state = ST_DIGIT
} else if unicode.IsLetter(r) {
state = ST_ALPHA
}
case ST_DIGIT: // starts digits
if unicode.IsDigit(r) {
continue
}
switch r {
case ',':
state = ST_DIGITCOMMA
case '-':
state = ST_DIGITDASH
case ':':
state = ST_DIGITCOLON
case '/':
state = ST_DIGITSLASH
firstSlash = i
}
case ST_DIGITDASH: // starts digit then dash 02-
// 2006-01-02T15:04:05Z07:00
// 2006-01-02T15:04:05.999999999Z07:00
// 2012-08-03 18:31:59.257000000
// 2014-04-26 17:24:37.3186369
// 2016-03-14 00:00:00.000
// 2014-05-11 08:20:13,787
// 2006-01-02
// 2013-04-01 22:43:22
// 2014-04-26 05:24:37 PM
switch {
case r == ' ':
state = ST_DIGITDASHWS
case r == 'T':
state = ST_DIGITDASHT
}
case ST_DIGITDASHWS: // starts digit then dash 02- then whitespace
// 2014-04-26 17:24:37.3186369
// 2012-08-03 18:31:59.257000000
// 2016-03-14 00:00:00.000
// 2013-04-01 22:43:22
// 2014-05-11 08:20:13,787
// 2014-04-26 05:24:37 PM
// 2014-12-16 06:20:00 UTC
switch r {
case 'A', 'P':
if len(datestr) == len("2014-04-26 03:24:37 PM") {
if t, err := time.Parse("2006-01-02 03:04:05 PM", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
case ',':
if len(datestr) == len("2014-05-11 08:20:13,787") {
// go doesn't seem to parse this one natively? or did i miss it?
if t, err := time.Parse("2006-01-02 03:04:05", datestr[:i]); err == nil {
ms, err := strconv.Atoi(datestr[i+1:])
if err == nil {
return time.Unix(0, t.UnixNano()+int64(ms)*1e6), nil
}
return time.Time{}, err
} else {
return time.Time{}, err
}
}
default:
if unicode.IsLetter(r) {
// 2014-12-16 06:20:00 UTC
state = ST_DIGITDASHWSALPHA
break iterRunes
}
}
case ST_DIGITDASHT: // starts digit then dash 02- then T
// 2006-01-02T15:04:05Z07:00
// 2006-01-02T15:04:05.999999999Z07:00
// 2006-01-02T15:04:05.999999999Z
// 2006-01-02T15:04:05.99999999Z
// 2006-01-02T15:04:05.9999999Z
// 2006-01-02T15:04:05.999999Z
// 2006-01-02T15:04:05.99999Z
// 2006-01-02T15:04:05.9999Z
// 2006-01-02T15:04:05.999Z
// 2006-01-02T15:04:05.99Z
if len(datestr) == len("2006-01-02T15:04:05Z07:00") {
if t, err := time.Parse("2006-01-02T15:04:05Z07:00", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("2006-01-02T15:04:05.999999999Z07:00") {
if t, err := time.Parse("2006-01-02T15:04:05.999999999Z07:00", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else {
// updated to include timestamps of different precisions
if t, err := time.Parse("2006-01-02T15:04:05.999999999Z", datestr); err == nil {
return t, nil
} else if t, err := time.Parse("2006-01-02T15:04:05.99999999Z", datestr); err == nil {
return t, nil
} else if t, err := time.Parse("2006-01-02T15:04:05.9999999Z", datestr); err == nil {
return t, nil
} else if t, err := time.Parse("2006-01-02T15:04:05.999999Z", datestr); err == nil {
return t, nil
} else if t, err := time.Parse("2006-01-02T15:04:05.99999Z", datestr); err == nil {
return t, nil
} else if t, err := time.Parse("2006-01-02T15:04:05.9999Z", datestr); err == nil {
return t, nil
} else if t, err := time.Parse("2006-01-02T15:04:05.999Z", datestr); err == nil {
return t, nil
} else if t, err := time.Parse("2006-01-02T15:04:05.99Z", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
case ST_DIGITSLASH: // starts digit then slash 02/
// 2014/07/10 06:55:38.156283
// 03/19/2012 10:11:59
// 04/2/2014 03:00:37
// 3/1/2012 10:11:59
// 4/8/2014 22:05
// 3/1/2014
// 10/13/2014
// 01/02/2006
if unicode.IsDigit(r) || r == '/' {
continue
}
switch r {
case ' ':
state = ST_DIGITSLASHWS
}
case ST_DIGITSLASHWS: // starts digit then slash 02/ more digits/slashes then whitespace
// 2014/07/10 06:55:38.156283
// 03/19/2012 10:11:59
// 04/2/2014 03:00:37
// 3/1/2012 10:11:59
// 4/8/2014 22:05
switch r {
case ':':
state = ST_DIGITSLASHWSCOLON
}
case ST_DIGITSLASHWSCOLON: // starts digit then slash 02/ more digits/slashes then whitespace
// 2014/07/10 06:55:38.156283
// 03/19/2012 10:11:59
// 04/2/2014 03:00:37
// 3/1/2012 10:11:59
// 4/8/2014 22:05
switch r {
case ':':
state = ST_DIGITSLASHWSCOLONCOLON
}
case ST_ALPHA: // starts alpha
// May 8, 2009 5:57:51 PM
// 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
// Mon, 02 Jan 2006 15:04:05 -0700
if unicode.IsLetter(r) {
continue
}
switch {
case r == ' ':
state = ST_ALPHAWS
case r == ',':
state = ST_ALPHACOMMA
// case unicode.IsDigit(r):
// state = ST_ALPHADIGIT
}
case ST_ALPHAWS: // Starts alpha then whitespace
switch {
// case r == ' ':
// state = ST_ALPHAWSWS
case r == ',':
state = ST_ALPHAWSCOMMA
case unicode.IsLetter(r):
state = ST_ALPHAWSALPHA
}
case ST_ALPHACOMMA: // Starts alpha then comma
// Mon, 02 Jan 2006 15:04:05 MST
// Mon, 02 Jan 2006 15:04:05 -0700
// Monday, 02-Jan-06 15:04:05 MST
switch {
case r == '-':
state = ST_ALPHACOMMADASH
}
case ST_ALPHACOMMADASH: // Starts alpha then comma and one dash
// Mon, 02 Jan 2006 15:04:05 -0700
// Monday, 02-Jan-06 15:04:05 MST
switch {
case r == '-':
state = ST_ALPHACOMMADASHDASH
}
case ST_ALPHAWSCOMMA: // Starts Alpha, whitespace, digit, comma
// May 8, 2009 5:57:51 PM
if t, err := time.Parse("Jan 2, 2006 3:04:05 PM", datestr); err == nil {
return t, nil
} else {
//u.Error(err)
}
case ST_ALPHAWSALPHA: // Starts Alpha, whitespace, alpha
// ANSIC = "Mon Jan _2 15:04:05 2006"
// UnixDate = "Mon Jan _2 15:04:05 MST 2006"
// RubyDate = "Mon Jan 02 15:04:05 -0700 2006"
if len(datestr) == len("Mon Jan _2 15:04:05 2006") {
if t, err := time.Parse(time.ANSIC, datestr); err == nil {
return t, nil
} else {
//break iterRunes
return time.Time{}, err
}
} else if len(datestr) == len("Mon Jan _2 15:04:05 MST 2006") {
if t, err := time.Parse(time.UnixDate, datestr); err == nil {
return t, nil
} else {
//break iterRunes
return time.Time{}, err
}
} else if len(datestr) == len("Mon Jan 02 15:04:05 -0700 2006") {
if t, err := time.Parse(time.RubyDate, datestr); err == nil {
return t, nil
} else {
//break iterRunes
return time.Time{}, err
}
}
default:
//u.Infof("no case for: %d", state)
break iterRunes
}
}
switch state {
case ST_DIGIT:
// unixy timestamps ish
if len(datestr) >= len("13980450781991351") {
if nanoSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
return time.Unix(0, nanoSecs), nil
} else {
return time.Time{}, err
}
} else if len(datestr) >= len("13980450781991") {
if microSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
return time.Unix(0, microSecs*1000), nil
} else {
return time.Time{}, err
}
} else if len(datestr) >= len("1384216367189") {
if miliSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
return time.Unix(0, miliSecs*1000*1000), nil
} else {
return time.Time{}, err
}
} else {
if secs, err := strconv.ParseInt(datestr, 10, 64); err == nil {
return time.Unix(secs, 0), nil
} else {
return time.Time{}, err
}
}
case ST_DIGITDASH: // starts digit then dash 02-
// 2006-01-02
if len(datestr) == len("2014-04-26") {
if t, err := time.Parse("2006-01-02", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
case ST_DIGITDASHWS: // starts digit then dash 02- then whitespace 1 << 2 << 5 + 3
// 2014-04-26 17:24:37.3186369
// 2012-08-03 18:31:59.257000000
// 2016-03-14 00:00:00.000
// 2013-04-01 22:43:22
if len(datestr) == len("2012-08-03 18:31:59.257000000") {
if t, err := time.Parse("2006-01-02 15:04:05.000000000", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("2014-04-26 05:24:37.3186369") {
if t, err := time.Parse("2006-01-02 15:04:05.0000000", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("2014-04-26 05:24:37.000") {
if t, err := time.Parse("2006-01-02 15:04:05.000", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("2013-04-01 22:43:22") {
if t, err := time.Parse("2006-01-02 15:04:05", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
case ST_DIGITDASHWSALPHA: // starts digit then dash 02- then whitespace 1 << 2 << 5 + 3
// 2014-12-16 06:20:00 UTC
if len(datestr) == len("2006-01-02 15:04:05 UTC") {
if t, err := time.Parse("2006-01-02 15:04:05 UTC", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
case ST_DIGITSLASH: // starts digit then slash 02/ (but nothing else)
// 3/1/2014
// 10/13/2014
// 01/02/2006
// 2014/10/13
if firstSlash == 4 {
if len(datestr) == len("2006/01/02") {
if t, err := time.Parse("2006/01/02", datestr); err == nil {
return t, nil
} else {
u.Errorf("hm: %v %s", err, datestr)
return time.Time{}, err
}
} else {
if t, err := time.Parse("2006/1/2", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
} else {
for _, parseFormat := range shortDates {
if t, err := time.Parse(parseFormat, datestr); err == nil {
return t, nil
}
}
return time.Time{}, fmt.Errorf("Unrecognized dateformat: %v", datestr)
}
case ST_DIGITSLASHWSCOLON: // starts digit then slash 02/ more digits/slashes then whitespace
// 4/8/2014 22:05
// 04/08/2014 22:05
// 2014/4/8 22:05
// 2014/04/08 22:05
if firstSlash == 4 {
if len(datestr) == len("2006/01/02 15:04") {
if t, err := time.Parse("2006/01/02 15:04", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("2006/01/2 15:04") {
if t, err := time.Parse("2006/01/2 15:04", datestr); err == nil {
return t, nil
} else {
if t, err := time.Parse("2006/1/02 15:04", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
} else {
if t, err := time.Parse("2006/1/2 15:04", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
} else {
if len(datestr) == len("01/02/2006 15:04") {
if t, err := time.Parse("01/02/2006 15:04", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("01/2/2006 15:04") {
if t, err := time.Parse("01/2/2006 15:04", datestr); err == nil {
return t, nil
} else {
if t, err := time.Parse("1/02/2006 15:04", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
} else {
if t, err := time.Parse("1/2/2006 15:04", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
}
case ST_DIGITSLASHWSCOLONCOLON: // starts digit then slash 02/ more digits/slashes then whitespace double colons
// 2014/07/10 06:55:38.156283
// 03/19/2012 10:11:59
// 3/1/2012 10:11:59
// 03/1/2012 10:11:59
// 3/01/2012 10:11:59
if firstSlash == 4 {
if len(datestr) == len("2014/07/10 06:55:38.156283") {
if t, err := time.Parse("2006/01/02 15:04:05.000000", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("2006/01/02 15:04:05") {
if t, err := time.Parse("2006/01/02 15:04:05", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("2006/01/2 15:04:05") {
if t, err := time.Parse("2006/01/2 15:04:05", datestr); err == nil {
return t, nil
} else {
if t, err := time.Parse("2006/1/02 15:04:05", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
} else {
if t, err := time.Parse("2006/1/2 15:04:05", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
} else {
if len(datestr) == len("07/10/2014 06:55:38.156283") {
if t, err := time.Parse("01/02/2006 15:04:05.000000", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("01/02/2006 15:04:05") {
if t, err := time.Parse("01/02/2006 15:04:05", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
} else if len(datestr) == len("01/2/2006 15:04:05") {
if t, err := time.Parse("01/2/2006 15:04:05", datestr); err == nil {
return t, nil
} else {
if t, err := time.Parse("1/02/2006 15:04:05", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
} else {
if t, err := time.Parse("1/2/2006 15:04:05", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
}
}
case ST_ALPHACOMMA: // Starts alpha then comma but no DASH
// Mon, 02 Jan 2006 15:04:05 MST
if t, err := time.Parse("Jan 2, 2006 3:04:05 PM", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
case ST_ALPHACOMMADASH: // Starts alpha then comma and one dash
// Mon, 02 Jan 2006 15:04:05 -0700
//RFC1123Z = "Mon, 02 Jan 2006 15:04:05 -0700" // RFC1123 with numeric zone
// TODO: this doesn't work???
if t, err := time.Parse(time.RFC1123Z, datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
case ST_ALPHACOMMADASHDASH: // Starts alpha then comma and two dash'es
// Monday, 02-Jan-06 15:04:05 MST
if t, err := time.Parse("Monday, 02-Jan-06 15:04:05 MST", datestr); err == nil {
return t, nil
} else {
return time.Time{}, err
}
default:
//u.Infof("no case for: %d : %s", state, datestr)
}
return time.Time{}, fmt.Errorf("Could not find date format for %s", datestr)
}
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