package dateparse import ( "fmt" "strconv" "time" "unicode" ) type DateState int const ( // C = Comma // O = Colon // E = Period/Dot // A = Alpha // N = Digits/Numeric // S = Slash / // P = Plus + // m = Minus, Dash, - // T = T // Z = Z // M = AM/PM // W = Whitespace ST_START DateState = iota ST_DIGIT ST_DIGITDASH ST_DIGITDASHWS ST_DIGITDASHWSWS ST_DIGITDASHWSWSAMPMMAYBE ST_DIGITDASHWSWSOFFSET ST_DIGITDASHWSWSOFFSETALPHA ST_DIGITDASHWSWSOFFSETCOLONALPHA ST_DIGITDASHWSWSOFFSETCOLON ST_DIGITDASHWSOFFSET ST_DIGITDASHWSWSALPHA ST_DIGITDASHWSDOT ST_DIGITDASHWSDOTALPHA ST_DIGITDASHWSDOTOFFSET ST_DIGITDASHWSDOTOFFSETALPHA ST_DIGITDASHT ST_DIGITDASHTZ ST_DIGITDASHTZDIGIT ST_DIGITDASHTDELTA ST_DIGITDASHTDELTACOLON ST_DIGITSLASH ST_DIGITSLASHWS ST_DIGITSLASHWSCOLON ST_DIGITSLASHWSCOLONAMPM ST_DIGITSLASHWSCOLONCOLON ST_DIGITSLASHWSCOLONCOLONAMPM ST_DIGITALPHA ST_ALPHA ST_ALPHAWS ST_ALPHAWSDIGITCOMMA ST_ALPHAWSALPHA ST_ALPHAWSALPHACOLON ST_ALPHAWSALPHACOLONOFFSET ST_ALPHAWSALPHACOLONALPHA ST_ALPHAWSALPHACOLONALPHAOFFSET ST_ALPHAWSALPHACOLONALPHAOFFSETALPHA ST_WEEKDAYCOMMA ST_WEEKDAYCOMMADELTA ST_WEEKDAYABBREVCOMMA ST_WEEKDAYABBREVCOMMADELTA ST_WEEKDAYABBREVCOMMADELTAZONE ) var ( shortDates = []string{"01/02/2006", "1/2/2006", "06/01/02", "01/02/06", "1/2/06"} ) // Parse a date, and panic if it can't be parsed func MustParse(datestr string) time.Time { t, err := ParseAny(datestr) if err != nil { panic(err.Error()) } return t } // 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 := rune(datestr[i]) // r, bytesConsumed := utf8.DecodeRuneInString(datestr[ri:]) // if bytesConsumed > 1 { // ri += (bytesConsumed - 1) // } 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 } else if unicode.IsLetter(r) { state = ST_DIGITALPHA continue } switch r { case '-', '\u2212': state = ST_DIGITDASH case '/': state = ST_DIGITSLASH firstSlash = i } case ST_DIGITDASH: // starts digit then dash 02- // 2006-01-02T15:04:05Z07:00 // 2017-06-25T17:46:57.45706582-07:00 // 2006-01-02T15:04:05.999999999Z07:00 // 2006-01-02T15:04:05+0000 // 2012-08-03 18:31:59.257000000 // 2014-04-26 17:24:37.3186369 // 2017-01-27 00:07:31.945167 // 2016-03-14 00:00:00.000 // 2014-05-11 08:20:13,787 // 2017-07-19 03:21:51+00:00 // 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: // 2013-04-01 22:43:22 // 2014-05-11 08:20:13,787 // ST_DIGITDASHWSWS // 2014-04-26 05:24:37 PM // 2014-12-16 06:20:00 UTC // 2015-02-18 00:12:00 +0000 UTC // 2006-01-02 15:04:05 -0700 // 2006-01-02 15:04:05 -07:00 // ST_DIGITDASHWSOFFSET // 2017-07-19 03:21:51+00:00 // ST_DIGITDASHWSDOT // 2014-04-26 17:24:37.3186369 // 2017-01-27 00:07:31.945167 // 2012-08-03 18:31:59.257000000 // 2016-03-14 00:00:00.000 // ST_DIGITDASHWSDOTOFFSET // 2017-01-27 00:07:31.945167 +0000 // 2016-03-14 00:00:00.000 +0000 // ST_DIGITDASHWSDOTOFFSETALPHA // 2017-01-27 00:07:31.945167 +0000 UTC // 2016-03-14 00:00:00.000 +0000 UTC // ST_DIGITDASHWSDOTALPHA // 2014-12-16 06:20:00.000 UTC switch r { 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? t, err := time.Parse("2006-01-02 03:04:05", datestr[:i]) if err == nil { ms, err := strconv.Atoi(datestr[i+1:]) if err == nil { return time.Unix(0, t.UnixNano()+int64(ms)*1e6), nil } } return t, err } case '-', '+': state = ST_DIGITDASHWSOFFSET case '.': state = ST_DIGITDASHWSDOT case ' ': state = ST_DIGITDASHWSWS } case ST_DIGITDASHWSWS: // ST_DIGITDASHWSWSALPHA // 2014-12-16 06:20:00 UTC // ST_DIGITDASHWSWSAMPMMAYBE // 2014-04-26 05:24:37 PM // ST_DIGITDASHWSWSOFFSET // 2006-01-02 15:04:05 -0700 // ST_DIGITDASHWSWSOFFSETCOLON // 2006-01-02 15:04:05 -07:00 // ST_DIGITDASHWSWSOFFSETCOLONALPHA // 2015-02-18 00:12:00 +00:00 UTC // ST_DIGITDASHWSWSOFFSETALPHA // 2015-02-18 00:12:00 +0000 UTC switch r { case 'A', 'P': state = ST_DIGITDASHWSWSAMPMMAYBE case '+', '-': state = ST_DIGITDASHWSWSOFFSET default: if unicode.IsLetter(r) { // 2014-12-16 06:20:00 UTC state = ST_DIGITDASHWSWSALPHA break iterRunes } } case ST_DIGITDASHWSWSAMPMMAYBE: if r == 'M' { return time.Parse("2006-01-02 03:04:05 PM", datestr) } state = ST_DIGITDASHWSWSALPHA case ST_DIGITDASHWSWSOFFSET: // ST_DIGITDASHWSWSOFFSET // 2006-01-02 15:04:05 -0700 // ST_DIGITDASHWSWSOFFSETCOLON // 2006-01-02 15:04:05 -07:00 // ST_DIGITDASHWSWSOFFSETCOLONALPHA // 2015-02-18 00:12:00 +00:00 UTC // ST_DIGITDASHWSWSOFFSETALPHA // 2015-02-18 00:12:00 +0000 UTC if r == ':' { state = ST_DIGITDASHWSWSOFFSETCOLON } else if unicode.IsLetter(r) { // 2015-02-18 00:12:00 +0000 UTC state = ST_DIGITDASHWSWSOFFSETALPHA break iterRunes } case ST_DIGITDASHWSWSOFFSETCOLON: // ST_DIGITDASHWSWSOFFSETCOLON // 2006-01-02 15:04:05 -07:00 // ST_DIGITDASHWSWSOFFSETCOLONALPHA // 2015-02-18 00:12:00 +00:00 UTC if unicode.IsLetter(r) { // 2015-02-18 00:12:00 +00:00 UTC state = ST_DIGITDASHWSWSOFFSETCOLONALPHA break iterRunes } case ST_DIGITDASHWSDOT: // 2014-04-26 17:24:37.3186369 // 2017-01-27 00:07:31.945167 // 2012-08-03 18:31:59.257000000 // 2016-03-14 00:00:00.000 // ST_DIGITDASHWSDOTOFFSET // 2017-01-27 00:07:31.945167 +0000 // 2016-03-14 00:00:00.000 +0000 // ST_DIGITDASHWSDOTOFFSETALPHA // 2017-01-27 00:07:31.945167 +0000 UTC // 2016-03-14 00:00:00.000 +0000 UTC // ST_DIGITDASHWSDOTALPHA // 2014-12-16 06:20:00.000 UTC if unicode.IsLetter(r) { // 2014-12-16 06:20:00.000 UTC state = ST_DIGITDASHWSDOTALPHA break iterRunes } else if r == '+' || r == '-' { state = ST_DIGITDASHWSDOTOFFSET } case ST_DIGITDASHWSDOTOFFSET: // 2017-01-27 00:07:31.945167 +0000 // 2016-03-14 00:00:00.000 +0000 // ST_DIGITDASHWSDOTOFFSETALPHA // 2017-01-27 00:07:31.945167 +0000 UTC // 2016-03-14 00:00:00.000 +0000 UTC if unicode.IsLetter(r) { // 2014-12-16 06:20:00.000 UTC // 2017-01-27 00:07:31.945167 +0000 UTC // 2016-03-14 00:00:00.000 +0000 UTC state = ST_DIGITDASHWSDOTOFFSETALPHA break iterRunes } case ST_DIGITDASHT: // starts digit then dash 02- then T // ST_DIGITDASHT // 2006-01-02T15:04:05 // ST_DIGITDASHTZ // 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 // 2009-08-12T22:15Z // ST_DIGITDASHTZDIGIT // 2006-01-02T15:04:05.999999999Z07:00 // 2006-01-02T15:04:05Z07:00 // With another dash aka time-zone at end // ST_DIGITDASHTDELTA // ST_DIGITDASHTDELTACOLON // 2017-06-25T17:46:57.45706582-07:00 // 2017-06-25T17:46:57+04:00 // 2006-01-02T15:04:05+0000 switch r { case '-', '+': state = ST_DIGITDASHTDELTA case 'Z': state = ST_DIGITDASHTZ } case ST_DIGITDASHTZ: if unicode.IsDigit(r) { state = ST_DIGITDASHTZDIGIT } case ST_DIGITDASHTDELTA: if r == ':' { state = ST_DIGITDASHTDELTACOLON } 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 // 1/2/06 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 // 3/1/2012 10:11:59 AM switch r { case ':': state = ST_DIGITSLASHWSCOLONCOLON case 'A', 'P': state = ST_DIGITSLASHWSCOLONAMPM } case ST_DIGITSLASHWSCOLONCOLON: // 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 // 3/1/2012 10:11:59 AM switch r { case 'A', 'P': state = ST_DIGITSLASHWSCOLONCOLONAMPM } case ST_DIGITALPHA: // 12 Feb 2006, 19:17 // 12 Feb 2006, 19:17:22 switch { case len(datestr) == len("02 Jan 2006, 15:04"): return time.Parse("02 Jan 2006, 15:04", datestr) case len(datestr) == len("02 Jan 2006, 15:04:05"): return time.Parse("02 Jan 2006, 15:04:05", datestr) } case ST_ALPHA: // starts alpha // ST_ALPHAWS // Mon Jan _2 15:04:05 2006 // Mon Jan _2 15:04:05 MST 2006 // Mon Jan 02 15:04:05 -0700 2006 // Mon Aug 10 15:44:11 UTC+0100 2015 // Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) // ST_ALPHAWSDIGITCOMMA // May 8, 2009 5:57:51 PM // // ST_WEEKDAYCOMMA // Monday, 02-Jan-06 15:04:05 MST // ST_WEEKDAYCOMMADELTA // Monday, 02 Jan 2006 15:04:05 -0700 // Monday, 02 Jan 2006 15:04:05 +0100 // ST_WEEKDAYABBREVCOMMA // Mon, 02-Jan-06 15:04:05 MST // Mon, 02 Jan 2006 15:04:05 MST // ST_WEEKDAYABBREVCOMMADELTA // Mon, 02 Jan 2006 15:04:05 -0700 // Thu, 13 Jul 2017 08:58:40 +0100 // ST_WEEKDAYABBREVCOMMADELTAZONE // Tue, 11 Jul 2017 16:28:13 +0200 (CEST) switch { case unicode.IsLetter(r): continue case r == ' ': state = ST_ALPHAWS case r == ',': if i == 3 { state = ST_WEEKDAYABBREVCOMMA } else { state = ST_WEEKDAYCOMMA } } case ST_WEEKDAYCOMMA: // Starts alpha then comma // Mon, 02-Jan-06 15:04:05 MST // Mon, 02 Jan 2006 15:04:05 MST // ST_WEEKDAYCOMMADELTA // Monday, 02 Jan 2006 15:04:05 -0700 // Monday, 02 Jan 2006 15:04:05 +0100 switch { case r == '-': if i < 15 { return time.Parse("Monday, 02-Jan-06 15:04:05 MST", datestr) } else { state = ST_WEEKDAYCOMMADELTA } case r == '+': state = ST_WEEKDAYCOMMADELTA } case ST_WEEKDAYABBREVCOMMA: // Starts alpha then comma // Mon, 02-Jan-06 15:04:05 MST // Mon, 02 Jan 2006 15:04:05 MST // ST_WEEKDAYABBREVCOMMADELTA // Mon, 02 Jan 2006 15:04:05 -0700 // Thu, 13 Jul 2017 08:58:40 +0100 // ST_WEEKDAYABBREVCOMMADELTAZONE // Tue, 11 Jul 2017 16:28:13 +0200 (CEST) switch { case r == '-': if i < 15 { return time.Parse("Mon, 02-Jan-06 15:04:05 MST", datestr) } else { state = ST_WEEKDAYABBREVCOMMADELTA } case r == '+': state = ST_WEEKDAYABBREVCOMMADELTA } case ST_WEEKDAYABBREVCOMMADELTA: // ST_WEEKDAYABBREVCOMMADELTA // Mon, 02 Jan 2006 15:04:05 -0700 // Thu, 13 Jul 2017 08:58:40 +0100 // ST_WEEKDAYABBREVCOMMADELTAZONE // Tue, 11 Jul 2017 16:28:13 +0200 (CEST) if r == '(' { state = ST_WEEKDAYABBREVCOMMADELTAZONE } case ST_ALPHAWS: // Starts alpha then whitespace // Mon Jan _2 15:04:05 2006 // Mon Jan _2 15:04:05 MST 2006 // Mon Jan 02 15:04:05 -0700 2006 // Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) // Mon Aug 10 15:44:11 UTC+0100 2015 switch { case unicode.IsLetter(r): state = ST_ALPHAWSALPHA case unicode.IsDigit(r): state = ST_ALPHAWSDIGITCOMMA } case ST_ALPHAWSDIGITCOMMA: // Starts Alpha, whitespace, digit, comma // May 8, 2009 5:57:51 PM return time.Parse("Jan 2, 2006 3:04:05 PM", datestr) case ST_ALPHAWSALPHA: // Alpha, whitespace, alpha // Mon Jan _2 15:04:05 2006 // Mon Jan 02 15:04:05 -0700 2006 // Mon Jan _2 15:04:05 MST 2006 // Mon Aug 10 15:44:11 UTC+0100 2015 // Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) if r == ':' { state = ST_ALPHAWSALPHACOLON } case ST_ALPHAWSALPHACOLON: // Alpha, whitespace, alpha, : // Mon Jan _2 15:04:05 2006 // Mon Jan 02 15:04:05 -0700 2006 // Mon Jan _2 15:04:05 MST 2006 // Mon Aug 10 15:44:11 UTC+0100 2015 // Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) if unicode.IsLetter(r) { state = ST_ALPHAWSALPHACOLONALPHA } else if r == '-' || r == '+' { state = ST_ALPHAWSALPHACOLONOFFSET } case ST_ALPHAWSALPHACOLONALPHA: // Alpha, whitespace, alpha, :, alpha // Mon Jan _2 15:04:05 MST 2006 // Mon Aug 10 15:44:11 UTC+0100 2015 // Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) if r == '+' { state = ST_ALPHAWSALPHACOLONALPHAOFFSET } case ST_ALPHAWSALPHACOLONALPHAOFFSET: // Alpha, whitespace, alpha, : , alpha, offset, ? // Mon Aug 10 15:44:11 UTC+0100 2015 // Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) if unicode.IsLetter(r) { state = ST_ALPHAWSALPHACOLONALPHAOFFSETALPHA } default: break iterRunes } } switch state { case ST_DIGIT: // unixy timestamps ish // 1499979655583057426 nanoseconds // 1499979795437000 micro-seconds // 1499979795437 milliseconds // 1384216367189 // 1332151919 seconds // 20140601 yyyymmdd // 2014 yyyy if len(datestr) > len("1499979795437000") { if nanoSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil { return time.Unix(0, nanoSecs), nil } } else if len(datestr) > len("1499979795437") { if microSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil { return time.Unix(0, microSecs*1000), nil } } else if len(datestr) > len("1332151919") { if miliSecs, err := strconv.ParseInt(datestr, 10, 64); err == nil { return time.Unix(0, miliSecs*1000*1000), nil } } else if len(datestr) == len("20140601") { return time.Parse("20060102", datestr) } else if len(datestr) == len("2014") { return time.Parse("2006", datestr) } else { if secs, err := strconv.ParseInt(datestr, 10, 64); err == nil { return time.Unix(secs, 0), nil } } case ST_DIGITDASH: // starts digit then dash 02- // 2006-01-02 // 2006-01 if len(datestr) == len("2014-04-26") { return time.Parse("2006-01-02", datestr) } else if len(datestr) == len("2014-04") { return time.Parse("2006-01", datestr) } case ST_DIGITDASHTDELTA: // 2006-01-02T15:04:05+0000 return time.Parse("2006-01-02T15:04:05-0700", datestr) case ST_DIGITDASHTDELTACOLON: // With another +/- time-zone at end // 2006-01-02T15:04:05.999999999+07:00 // 2006-01-02T15:04:05.999999999-07:00 // 2006-01-02T15:04:05.999999+07:00 // 2006-01-02T15:04:05.999999-07:00 // 2006-01-02T15:04:05.999+07:00 // 2006-01-02T15:04:05.999-07:00 // 2006-01-02T15:04:05+07:00 // 2006-01-02T15:04:05-07:00 return time.Parse("2006-01-02T15:04:05-07:00", datestr) case ST_DIGITDASHT: // starts digit then dash 02- then T // 2006-01-02T15:04:05.999999 // 2006-01-02T15:04:05.999999 return time.Parse("2006-01-02T15:04:05", datestr) case ST_DIGITDASHTZDIGIT: // With a time-zone at end after Z // 2006-01-02T15:04:05.999999999Z07:00 // 2006-01-02T15:04:05Z07:00 // RFC3339 = "2006-01-02T15:04:05Z07:00" // RFC3339Nano = "2006-01-02T15:04:05.999999999Z07:00" return time.Time{}, fmt.Errorf("RFC339 Dates may not contain both Z & Offset for %q see https://github.com/golang/go/issues/5294", datestr) case ST_DIGITDASHTZ: // starts digit then dash 02- then T Then Z // 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 // 2009-08-12T22:15Z -- No seconds/milliseconds switch len(datestr) { case len("2009-08-12T22:15Z"): return time.Parse("2006-01-02T15:04Z", datestr) default: return time.Parse("2006-01-02T15:04:05Z", datestr) } case ST_DIGITDASHWS: // starts digit then dash 02- then whitespace 1 << 2 << 5 + 3 // 2013-04-01 22:43:22 return time.Parse("2006-01-02 15:04:05", datestr) case ST_DIGITDASHWSWSOFFSET: // 2006-01-02 15:04:05 -0700 return time.Parse("2006-01-02 15:04:05 -0700", datestr) case ST_DIGITDASHWSWSOFFSETCOLON: // 2006-01-02 15:04:05 -07:00 return time.Parse("2006-01-02 15:04:05 -07:00", datestr) case ST_DIGITDASHWSWSOFFSETALPHA: // 2015-02-18 00:12:00 +0000 UTC t, err := time.Parse("2006-01-02 15:04:05 -0700 UTC", datestr) if err == nil { return t, nil } return time.Parse("2006-01-02 15:04:05 +0000 GMT", datestr) case ST_DIGITDASHWSWSOFFSETCOLONALPHA: // 2015-02-18 00:12:00 +00:00 UTC return time.Parse("2006-01-02 15:04:05 -07:00 UTC", datestr) case ST_DIGITDASHWSOFFSET: // 2017-07-19 03:21:51+00:00 return time.Parse("2006-01-02 15:04:05-07:00", datestr) case ST_DIGITDASHWSWSALPHA: // 2014-12-16 06:20:00 UTC t, err := time.Parse("2006-01-02 15:04:05 UTC", datestr) if err == nil { return t, nil } t, err = time.Parse("2006-01-02 15:04:05 GMT", datestr) if err == nil { return t, nil } if len(datestr) > len("2006-01-02 03:04:05") { t, err = time.Parse("2006-01-02 03:04:05", datestr[:len("2006-01-02 03:04:05")]) if err == nil { return t, nil } } case ST_DIGITDASHWSDOT: // 2012-08-03 18:31:59.257000000 // 2014-04-26 17:24:37.3186369 // 2017-01-27 00:07:31.945167 // 2016-03-14 00:00:00.000 return time.Parse("2006-01-02 15:04:05", datestr) case ST_DIGITDASHWSDOTALPHA: // 2012-08-03 18:31:59.257000000 UTC // 2014-04-26 17:24:37.3186369 UTC // 2017-01-27 00:07:31.945167 UTC // 2016-03-14 00:00:00.000 UTC return time.Parse("2006-01-02 15:04:05 UTC", datestr) case ST_DIGITDASHWSDOTOFFSET: // 2012-08-03 18:31:59.257000000 +0000 // 2014-04-26 17:24:37.3186369 +0000 // 2017-01-27 00:07:31.945167 +0000 // 2016-03-14 00:00:00.000 +0000 return time.Parse("2006-01-02 15:04:05 -0700", datestr) case ST_DIGITDASHWSDOTOFFSETALPHA: // 2012-08-03 18:31:59.257000000 +0000 UTC // 2014-04-26 17:24:37.3186369 +0000 UTC // 2017-01-27 00:07:31.945167 +0000 UTC // 2016-03-14 00:00:00.000 +0000 UTC return time.Parse("2006-01-02 15:04:05 -0700 UTC", datestr) case ST_ALPHAWSALPHACOLON: // Mon Jan _2 15:04:05 2006 return time.Parse(time.ANSIC, datestr) case ST_ALPHAWSALPHACOLONOFFSET: // Mon Jan 02 15:04:05 -0700 2006 return time.Parse(time.RubyDate, datestr) case ST_ALPHAWSALPHACOLONALPHA: // Mon Jan _2 15:04:05 MST 2006 return time.Parse(time.UnixDate, datestr) case ST_ALPHAWSALPHACOLONALPHAOFFSET: // Mon Aug 10 15:44:11 UTC+0100 2015 return time.Parse("Mon Jan 02 15:04:05 MST-0700 2006", datestr) case ST_ALPHAWSALPHACOLONALPHAOFFSETALPHA: // Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) if len(datestr) > len("Mon Jan 02 2006 15:04:05 MST-0700") { // What effing time stamp is this? // Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) dateTmp := datestr[:33] return time.Parse("Mon Jan 02 2006 15:04:05 MST-0700", dateTmp) } 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") { return time.Parse("2006/01/02", datestr) } else { return time.Parse("2006/1/2", datestr) } } else { for _, parseFormat := range shortDates { if t, err := time.Parse(parseFormat, datestr); err == nil { return t, nil } } } 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 { for _, layout := range []string{"2006/01/02 15:04", "2006/1/2 15:04", "2006/01/2 15:04", "2006/1/02 15:04"} { if t, err := time.Parse(layout, datestr); err == nil { return t, nil } } } else { for _, layout := range []string{"01/02/2006 15:04", "01/2/2006 15:04", "1/02/2006 15:04", "1/2/2006 15:04"} { if t, err := time.Parse(layout, datestr); err == nil { return t, nil } } } case ST_DIGITSLASHWSCOLONAMPM: // starts digit then slash 02/ more digits/slashes then whitespace // 4/8/2014 22:05 PM // 04/08/2014 22:05 PM // 04/08/2014 1:05 PM // 2014/4/8 22:05 PM // 2014/04/08 22:05 PM if firstSlash == 4 { for _, layout := range []string{"2006/01/02 03:04 PM", "2006/01/2 03:04 PM", "2006/1/02 03:04 PM", "2006/1/2 03:04 PM", "2006/01/02 3:04 PM", "2006/01/2 3:04 PM", "2006/1/02 3:04 PM", "2006/1/2 3:04 PM"} { if t, err := time.Parse(layout, datestr); err == nil { return t, nil } } } else { for _, layout := range []string{"01/02/2006 03:04 PM", "01/2/2006 03:04 PM", "1/02/2006 03:04 PM", "1/2/2006 03:04 PM", "01/02/2006 3:04 PM", "01/2/2006 3:04 PM", "1/02/2006 3:04 PM", "1/2/2006 3:04 PM"} { if t, err := time.Parse(layout, datestr); err == nil { return t, nil } } } 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 { for _, layout := range []string{"2006/01/02 15:04:05", "2006/1/02 15:04:05", "2006/01/2 15:04:05", "2006/1/2 15:04:05"} { if t, err := time.Parse(layout, datestr); err == nil { return t, nil } } } else { for _, layout := range []string{"01/02/2006 15:04:05", "1/02/2006 15:04:05", "01/2/2006 15:04:05", "1/2/2006 15:04:05"} { if t, err := time.Parse(layout, datestr); err == nil { return t, nil } } } case ST_DIGITSLASHWSCOLONCOLONAMPM: // starts digit then slash 02/ more digits/slashes then whitespace double colons // 2014/07/10 06:55:38.156283 PM // 03/19/2012 10:11:59 PM // 3/1/2012 10:11:59 PM // 03/1/2012 10:11:59 PM // 3/01/2012 10:11:59 PM if firstSlash == 4 { for _, layout := range []string{"2006/01/02 03:04:05 PM", "2006/1/02 03:04:05 PM", "2006/01/2 03:04:05 PM", "2006/1/2 03:04:05 PM", "2006/01/02 3:04:05 PM", "2006/1/02 3:04:05 PM", "2006/01/2 3:04:05 PM", "2006/1/2 3:04:05 PM"} { if t, err := time.Parse(layout, datestr); err == nil { return t, nil } } } else { for _, layout := range []string{"01/02/2006 03:04:05 PM", "1/02/2006 03:04:05 PM", "01/2/2006 03:04:05 PM", "1/2/2006 03:04:05 PM"} { if t, err := time.Parse(layout, datestr); err == nil { return t, nil } } } case ST_WEEKDAYCOMMADELTA: // Monday, 02 Jan 2006 15:04:05 -0700 // Monday, 02 Jan 2006 15:04:05 +0100 return time.Parse("Monday, 02 Jan 2006 15:04:05 -0700", datestr) case ST_WEEKDAYABBREVCOMMA: // Starts alpha then comma // Mon, 02-Jan-06 15:04:05 MST // Mon, 02 Jan 2006 15:04:05 MST return time.Parse("Mon, 02 Jan 2006 15:04:05 MST", datestr) case ST_WEEKDAYABBREVCOMMADELTA: // Mon, 02 Jan 2006 15:04:05 -0700 // Thu, 13 Jul 2017 08:58:40 +0100 // RFC1123Z = "Mon, 02 Jan 2006 15:04:05 -0700" // RFC1123 with numeric zone return time.Parse("Mon, 02 Jan 2006 15:04:05 -0700", datestr) case ST_WEEKDAYABBREVCOMMADELTAZONE: // Tue, 11 Jul 2017 16:28:13 +0200 (CEST) return time.Parse("Mon, 02 Jan 2006 15:04:05 -0700 (CEST)", datestr) } return time.Time{}, fmt.Errorf("Could not find date format for %s", datestr) }