Add support for dates of the form "yyyy mmm dd" where mmm is an alpha literal

Fixes #141

Signed-off-by: Daniel Ferstay <dferstay@splunk.com>

parseany.go

@@ -93,6 +93,8 @@ const (
 	dateAlphaPeriodWsDigit
 	dateWeekdayComma
 	dateWeekdayAbbrevComma
+	dateYearWs
+	dateYearWsMonthWs
 )
 const (
 	// Time state
@@ -388,7 +390,13 @@ iterRunes:
 				// 02 Jan 2018 23:59:34
 				// 12 Feb 2006, 19:17
 				// 12 Feb 2006, 19:17:22
-				if i == 6 {
+				// 2013 Jan 06 15:04:05
+				if i == 4 {
+					p.yearlen = i
+					p.moi = i + 1
+					p.setYear()
+					p.stateDate = dateYearWs
+				} else if i == 6 {
 					p.stateDate = dateDigitSt
 				} else {
 					p.stateDate = dateDigitWs
@@ -704,6 +712,30 @@ iterRunes:
 			// 18 January 2018
 			// 8 January 2018
 
+		case dateYearWs:
+			// 2013 Jan 06 15:04:05
+			if r == ' ' {
+				p.molen = i - p.moi
+				p.set(p.moi, "Jan")
+				p.dayi = i + 1
+				p.stateDate = dateYearWsMonthWs
+			}
+		case dateYearWsMonthWs:
+			// 2013 Jan 06 15:04:05
+			switch r {
+			case ',':
+				p.daylen = i - p.dayi
+				p.setDay()
+				i++
+				p.stateTime = timeStart
+				break iterRunes
+			case ' ':
+				p.daylen = i - p.dayi
+				p.setDay()
+				p.stateTime = timeStart
+				break iterRunes
+			}
+
 		case dateDigitChineseYear:
 			// dateDigitChineseYear
 			//   2014年04月08日
@@ -1949,6 +1981,8 @@ iterRunes:
 		// Mon, 02 Jan 2006 15:04:05 MST
 		return p, nil
 
+	case dateYearWsMonthWs:
+		return p, nil
 	}
 
 	return nil, unknownErr(datestr)

parseany_test.go

@@ -154,6 +154,8 @@ var testInputs = []dateTest{
 	{in: "07 Feb 2004 09:07", out: "2004-02-07 09:07:00 +0000 UTC"},
 	{in: "7 Feb 2004 9:7:8", out: "2004-02-07 09:07:08 +0000 UTC"},
 	{in: "07 Feb 2004 09:07:08.123", out: "2004-02-07 09:07:08.123 +0000 UTC"},
+	/// yyyy mmm dd https://github.com/araddon/dateparse/issues/141
+	{in: "2013 May 02 11:37:55", out: "2013-05-02 11:37:55 +0000 UTC"},
 	//  dd-mon-yyyy  12 Feb 2006, 19:17:08 GMT
 	{in: "07 Feb 2004, 09:07:07 GMT", out: "2004-02-07 09:07:07 +0000 UTC"},
 	//  dd-mon-yyyy  12 Feb 2006, 19:17:08 +0100