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      1 // Copyright 2009 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package time_test
      6 
      7 import (
      8 	"fmt"
      9 	"strconv"
     10 	"strings"
     11 	"testing"
     12 	"testing/quick"
     13 	. "time"
     14 )
     15 
     16 type TimeFormatTest struct {
     17 	time           Time
     18 	formattedValue string
     19 }
     20 
     21 var rfc3339Formats = []TimeFormatTest{
     22 	{Date(2008, 9, 17, 20, 4, 26, 0, UTC), "2008-09-17T20:04:26Z"},
     23 	{Date(1994, 9, 17, 20, 4, 26, 0, FixedZone("EST", -18000)), "1994-09-17T20:04:26-05:00"},
     24 	{Date(2000, 12, 26, 1, 15, 6, 0, FixedZone("OTO", 15600)), "2000-12-26T01:15:06+04:20"},
     25 }
     26 
     27 func TestRFC3339Conversion(t *testing.T) {
     28 	for _, f := range rfc3339Formats {
     29 		if f.time.Format(RFC3339) != f.formattedValue {
     30 			t.Error("RFC3339:")
     31 			t.Errorf("  want=%+v", f.formattedValue)
     32 			t.Errorf("  have=%+v", f.time.Format(RFC3339))
     33 		}
     34 	}
     35 }
     36 
     37 type FormatTest struct {
     38 	name   string
     39 	format string
     40 	result string
     41 }
     42 
     43 var formatTests = []FormatTest{
     44 	{"ANSIC", ANSIC, "Wed Feb  4 21:00:57 2009"},
     45 	{"UnixDate", UnixDate, "Wed Feb  4 21:00:57 PST 2009"},
     46 	{"RubyDate", RubyDate, "Wed Feb 04 21:00:57 -0800 2009"},
     47 	{"RFC822", RFC822, "04 Feb 09 21:00 PST"},
     48 	{"RFC850", RFC850, "Wednesday, 04-Feb-09 21:00:57 PST"},
     49 	{"RFC1123", RFC1123, "Wed, 04 Feb 2009 21:00:57 PST"},
     50 	{"RFC1123Z", RFC1123Z, "Wed, 04 Feb 2009 21:00:57 -0800"},
     51 	{"RFC3339", RFC3339, "2009-02-04T21:00:57-08:00"},
     52 	{"RFC3339Nano", RFC3339Nano, "2009-02-04T21:00:57.0123456-08:00"},
     53 	{"Kitchen", Kitchen, "9:00PM"},
     54 	{"am/pm", "3pm", "9pm"},
     55 	{"AM/PM", "3PM", "9PM"},
     56 	{"two-digit year", "06 01 02", "09 02 04"},
     57 	// Three-letter months and days must not be followed by lower-case letter.
     58 	{"Janet", "Hi Janet, the Month is January", "Hi Janet, the Month is February"},
     59 	// Time stamps, Fractional seconds.
     60 	{"Stamp", Stamp, "Feb  4 21:00:57"},
     61 	{"StampMilli", StampMilli, "Feb  4 21:00:57.012"},
     62 	{"StampMicro", StampMicro, "Feb  4 21:00:57.012345"},
     63 	{"StampNano", StampNano, "Feb  4 21:00:57.012345600"},
     64 }
     65 
     66 func TestFormat(t *testing.T) {
     67 	// The numeric time represents Thu Feb  4 21:00:57.012345600 PST 2010
     68 	time := Unix(0, 1233810057012345600)
     69 	for _, test := range formatTests {
     70 		result := time.Format(test.format)
     71 		if result != test.result {
     72 			t.Errorf("%s expected %q got %q", test.name, test.result, result)
     73 		}
     74 	}
     75 }
     76 
     77 // issue 12440.
     78 func TestFormatSingleDigits(t *testing.T) {
     79 	time := Date(2001, 2, 3, 4, 5, 6, 700000000, UTC)
     80 	test := FormatTest{"single digit format", "3:4:5", "4:5:6"}
     81 	result := time.Format(test.format)
     82 	if result != test.result {
     83 		t.Errorf("%s expected %q got %q", test.name, test.result, result)
     84 	}
     85 }
     86 
     87 func TestFormatShortYear(t *testing.T) {
     88 	years := []int{
     89 		-100001, -100000, -99999,
     90 		-10001, -10000, -9999,
     91 		-1001, -1000, -999,
     92 		-101, -100, -99,
     93 		-11, -10, -9,
     94 		-1, 0, 1,
     95 		9, 10, 11,
     96 		99, 100, 101,
     97 		999, 1000, 1001,
     98 		9999, 10000, 10001,
     99 		99999, 100000, 100001,
    100 	}
    101 
    102 	for _, y := range years {
    103 		time := Date(y, January, 1, 0, 0, 0, 0, UTC)
    104 		result := time.Format("2006.01.02")
    105 		var want string
    106 		if y < 0 {
    107 			// The 4 in %04d counts the - sign, so print -y instead
    108 			// and introduce our own - sign.
    109 			want = fmt.Sprintf("-%04d.%02d.%02d", -y, 1, 1)
    110 		} else {
    111 			want = fmt.Sprintf("%04d.%02d.%02d", y, 1, 1)
    112 		}
    113 		if result != want {
    114 			t.Errorf("(jan 1 %d).Format(\"2006.01.02\") = %q, want %q", y, result, want)
    115 		}
    116 	}
    117 }
    118 
    119 type ParseTest struct {
    120 	name       string
    121 	format     string
    122 	value      string
    123 	hasTZ      bool // contains a time zone
    124 	hasWD      bool // contains a weekday
    125 	yearSign   int  // sign of year, -1 indicates the year is not present in the format
    126 	fracDigits int  // number of digits of fractional second
    127 }
    128 
    129 var parseTests = []ParseTest{
    130 	{"ANSIC", ANSIC, "Thu Feb  4 21:00:57 2010", false, true, 1, 0},
    131 	{"UnixDate", UnixDate, "Thu Feb  4 21:00:57 PST 2010", true, true, 1, 0},
    132 	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 -0800 2010", true, true, 1, 0},
    133 	{"RFC850", RFC850, "Thursday, 04-Feb-10 21:00:57 PST", true, true, 1, 0},
    134 	{"RFC1123", RFC1123, "Thu, 04 Feb 2010 21:00:57 PST", true, true, 1, 0},
    135 	{"RFC1123", RFC1123, "Thu, 04 Feb 2010 22:00:57 PDT", true, true, 1, 0},
    136 	{"RFC1123Z", RFC1123Z, "Thu, 04 Feb 2010 21:00:57 -0800", true, true, 1, 0},
    137 	{"RFC3339", RFC3339, "2010-02-04T21:00:57-08:00", true, false, 1, 0},
    138 	{"custom: \"2006-01-02 15:04:05-07\"", "2006-01-02 15:04:05-07", "2010-02-04 21:00:57-08", true, false, 1, 0},
    139 	// Optional fractional seconds.
    140 	{"ANSIC", ANSIC, "Thu Feb  4 21:00:57.0 2010", false, true, 1, 1},
    141 	{"UnixDate", UnixDate, "Thu Feb  4 21:00:57.01 PST 2010", true, true, 1, 2},
    142 	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57.012 -0800 2010", true, true, 1, 3},
    143 	{"RFC850", RFC850, "Thursday, 04-Feb-10 21:00:57.0123 PST", true, true, 1, 4},
    144 	{"RFC1123", RFC1123, "Thu, 04 Feb 2010 21:00:57.01234 PST", true, true, 1, 5},
    145 	{"RFC1123Z", RFC1123Z, "Thu, 04 Feb 2010 21:00:57.01234 -0800", true, true, 1, 5},
    146 	{"RFC3339", RFC3339, "2010-02-04T21:00:57.012345678-08:00", true, false, 1, 9},
    147 	{"custom: \"2006-01-02 15:04:05\"", "2006-01-02 15:04:05", "2010-02-04 21:00:57.0", false, false, 1, 0},
    148 	// Amount of white space should not matter.
    149 	{"ANSIC", ANSIC, "Thu Feb 4 21:00:57 2010", false, true, 1, 0},
    150 	{"ANSIC", ANSIC, "Thu      Feb     4     21:00:57     2010", false, true, 1, 0},
    151 	// Case should not matter
    152 	{"ANSIC", ANSIC, "THU FEB 4 21:00:57 2010", false, true, 1, 0},
    153 	{"ANSIC", ANSIC, "thu feb 4 21:00:57 2010", false, true, 1, 0},
    154 	// Fractional seconds.
    155 	{"millisecond", "Mon Jan _2 15:04:05.000 2006", "Thu Feb  4 21:00:57.012 2010", false, true, 1, 3},
    156 	{"microsecond", "Mon Jan _2 15:04:05.000000 2006", "Thu Feb  4 21:00:57.012345 2010", false, true, 1, 6},
    157 	{"nanosecond", "Mon Jan _2 15:04:05.000000000 2006", "Thu Feb  4 21:00:57.012345678 2010", false, true, 1, 9},
    158 	// Leading zeros in other places should not be taken as fractional seconds.
    159 	{"zero1", "2006.01.02.15.04.05.0", "2010.02.04.21.00.57.0", false, false, 1, 1},
    160 	{"zero2", "2006.01.02.15.04.05.00", "2010.02.04.21.00.57.01", false, false, 1, 2},
    161 	// Month and day names only match when not followed by a lower-case letter.
    162 	{"Janet", "Hi Janet, the Month is January: Jan _2 15:04:05 2006", "Hi Janet, the Month is February: Feb  4 21:00:57 2010", false, true, 1, 0},
    163 
    164 	// GMT with offset.
    165 	{"GMT-8", UnixDate, "Fri Feb  5 05:00:57 GMT-8 2010", true, true, 1, 0},
    166 
    167 	// Accept any number of fractional second digits (including none) for .999...
    168 	// In Go 1, .999... was completely ignored in the format, meaning the first two
    169 	// cases would succeed, but the next four would not. Go 1.1 accepts all six.
    170 	{"", "2006-01-02 15:04:05.9999 -0700 MST", "2010-02-04 21:00:57 -0800 PST", true, false, 1, 0},
    171 	{"", "2006-01-02 15:04:05.999999999 -0700 MST", "2010-02-04 21:00:57 -0800 PST", true, false, 1, 0},
    172 	{"", "2006-01-02 15:04:05.9999 -0700 MST", "2010-02-04 21:00:57.0123 -0800 PST", true, false, 1, 4},
    173 	{"", "2006-01-02 15:04:05.999999999 -0700 MST", "2010-02-04 21:00:57.0123 -0800 PST", true, false, 1, 4},
    174 	{"", "2006-01-02 15:04:05.9999 -0700 MST", "2010-02-04 21:00:57.012345678 -0800 PST", true, false, 1, 9},
    175 	{"", "2006-01-02 15:04:05.999999999 -0700 MST", "2010-02-04 21:00:57.012345678 -0800 PST", true, false, 1, 9},
    176 
    177 	// issue 4502.
    178 	{"", StampNano, "Feb  4 21:00:57.012345678", false, false, -1, 9},
    179 	{"", "Jan _2 15:04:05.999", "Feb  4 21:00:57.012300000", false, false, -1, 4},
    180 	{"", "Jan _2 15:04:05.999", "Feb  4 21:00:57.012345678", false, false, -1, 9},
    181 	{"", "Jan _2 15:04:05.999999999", "Feb  4 21:00:57.0123", false, false, -1, 4},
    182 	{"", "Jan _2 15:04:05.999999999", "Feb  4 21:00:57.012345678", false, false, -1, 9},
    183 }
    184 
    185 func TestParse(t *testing.T) {
    186 	for _, test := range parseTests {
    187 		time, err := Parse(test.format, test.value)
    188 		if err != nil {
    189 			t.Errorf("%s error: %v", test.name, err)
    190 		} else {
    191 			checkTime(time, &test, t)
    192 		}
    193 	}
    194 }
    195 
    196 // All parsed with ANSIC.
    197 var dayOutOfRangeTests = []struct {
    198 	date string
    199 	ok   bool
    200 }{
    201 	{"Thu Jan 99 21:00:57 2010", false},
    202 	{"Thu Jan 31 21:00:57 2010", true},
    203 	{"Thu Jan 32 21:00:57 2010", false},
    204 	{"Thu Feb 28 21:00:57 2012", true},
    205 	{"Thu Feb 29 21:00:57 2012", true},
    206 	{"Thu Feb 29 21:00:57 2010", false},
    207 	{"Thu Mar 31 21:00:57 2010", true},
    208 	{"Thu Mar 32 21:00:57 2010", false},
    209 	{"Thu Apr 30 21:00:57 2010", true},
    210 	{"Thu Apr 31 21:00:57 2010", false},
    211 	{"Thu May 31 21:00:57 2010", true},
    212 	{"Thu May 32 21:00:57 2010", false},
    213 	{"Thu Jun 30 21:00:57 2010", true},
    214 	{"Thu Jun 31 21:00:57 2010", false},
    215 	{"Thu Jul 31 21:00:57 2010", true},
    216 	{"Thu Jul 32 21:00:57 2010", false},
    217 	{"Thu Aug 31 21:00:57 2010", true},
    218 	{"Thu Aug 32 21:00:57 2010", false},
    219 	{"Thu Sep 30 21:00:57 2010", true},
    220 	{"Thu Sep 31 21:00:57 2010", false},
    221 	{"Thu Oct 31 21:00:57 2010", true},
    222 	{"Thu Oct 32 21:00:57 2010", false},
    223 	{"Thu Nov 30 21:00:57 2010", true},
    224 	{"Thu Nov 31 21:00:57 2010", false},
    225 	{"Thu Dec 31 21:00:57 2010", true},
    226 	{"Thu Dec 32 21:00:57 2010", false},
    227 	{"Thu Dec 00 21:00:57 2010", false},
    228 }
    229 
    230 func TestParseDayOutOfRange(t *testing.T) {
    231 	for _, test := range dayOutOfRangeTests {
    232 		_, err := Parse(ANSIC, test.date)
    233 		switch {
    234 		case test.ok && err == nil:
    235 			// OK
    236 		case !test.ok && err != nil:
    237 			if !strings.Contains(err.Error(), "day out of range") {
    238 				t.Errorf("%q: expected 'day' error, got %v", test.date, err)
    239 			}
    240 		case test.ok && err != nil:
    241 			t.Errorf("%q: unexpected error: %v", test.date, err)
    242 		case !test.ok && err == nil:
    243 			t.Errorf("%q: expected 'day' error, got none", test.date)
    244 		}
    245 	}
    246 }
    247 
    248 // TestParseInLocation checks that the Parse and ParseInLocation
    249 // functions do not get confused by the fact that AST (Arabia Standard
    250 // Time) and AST (Atlantic Standard Time) are different time zones,
    251 // even though they have the same abbreviation.
    252 //
    253 // ICANN has been slowly phasing out invented abbreviation in favor of
    254 // numeric time zones (for example, the Asia/Baghdad time zone
    255 // abbreviation got changed from AST to +03 in the 2017a tzdata
    256 // release); but we still want to make sure that the time package does
    257 // not get confused on systems with slightly older tzdata packages.
    258 func TestParseInLocation(t *testing.T) {
    259 
    260 	baghdad, err := LoadLocation("Asia/Baghdad")
    261 	if err != nil {
    262 		t.Fatal(err)
    263 	}
    264 
    265 	var t1, t2 Time
    266 
    267 	t1, err = ParseInLocation("Jan 02 2006 MST", "Feb 01 2013 AST", baghdad)
    268 	if err != nil {
    269 		t.Fatal(err)
    270 	}
    271 
    272 	_, offset := t1.Zone()
    273 
    274 	// A zero offset means that ParseInLocation did not recognize the
    275 	// 'AST' abbreviation as matching the current location (Baghdad,
    276 	// where we'd expect a +03 hrs offset); likely because we're using
    277 	// a recent tzdata release (2017a or newer).
    278 	// If it happens, skip the Baghdad test.
    279 	if offset != 0 {
    280 		t2 = Date(2013, February, 1, 00, 00, 00, 0, baghdad)
    281 		if t1 != t2 {
    282 			t.Fatalf("ParseInLocation(Feb 01 2013 AST, Baghdad) = %v, want %v", t1, t2)
    283 		}
    284 		if offset != 3*60*60 {
    285 			t.Fatalf("ParseInLocation(Feb 01 2013 AST, Baghdad).Zone = _, %d, want _, %d", offset, 3*60*60)
    286 		}
    287 	}
    288 
    289 	blancSablon, err := LoadLocation("America/Blanc-Sablon")
    290 	if err != nil {
    291 		t.Fatal(err)
    292 	}
    293 
    294 	// In this case 'AST' means 'Atlantic Standard Time', and we
    295 	// expect the abbreviation to correctly match the american
    296 	// location.
    297 	t1, err = ParseInLocation("Jan 02 2006 MST", "Feb 01 2013 AST", blancSablon)
    298 	if err != nil {
    299 		t.Fatal(err)
    300 	}
    301 	t2 = Date(2013, February, 1, 00, 00, 00, 0, blancSablon)
    302 	if t1 != t2 {
    303 		t.Fatalf("ParseInLocation(Feb 01 2013 AST, Blanc-Sablon) = %v, want %v", t1, t2)
    304 	}
    305 	_, offset = t1.Zone()
    306 	if offset != -4*60*60 {
    307 		t.Fatalf("ParseInLocation(Feb 01 2013 AST, Blanc-Sablon).Zone = _, %d, want _, %d", offset, -4*60*60)
    308 	}
    309 }
    310 
    311 func TestLoadLocationZipFile(t *testing.T) {
    312 	ForceZipFileForTesting(true)
    313 	defer ForceZipFileForTesting(false)
    314 
    315 	_, err := LoadLocation("Australia/Sydney")
    316 	if err != nil {
    317 		t.Fatal(err)
    318 	}
    319 }
    320 
    321 var rubyTests = []ParseTest{
    322 	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 -0800 2010", true, true, 1, 0},
    323 	// Ignore the time zone in the test. If it parses, it'll be OK.
    324 	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 -0000 2010", false, true, 1, 0},
    325 	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 +0000 2010", false, true, 1, 0},
    326 	{"RubyDate", RubyDate, "Thu Feb 04 21:00:57 +1130 2010", false, true, 1, 0},
    327 }
    328 
    329 // Problematic time zone format needs special tests.
    330 func TestRubyParse(t *testing.T) {
    331 	for _, test := range rubyTests {
    332 		time, err := Parse(test.format, test.value)
    333 		if err != nil {
    334 			t.Errorf("%s error: %v", test.name, err)
    335 		} else {
    336 			checkTime(time, &test, t)
    337 		}
    338 	}
    339 }
    340 
    341 func checkTime(time Time, test *ParseTest, t *testing.T) {
    342 	// The time should be Thu Feb  4 21:00:57 PST 2010
    343 	if test.yearSign >= 0 && test.yearSign*time.Year() != 2010 {
    344 		t.Errorf("%s: bad year: %d not %d", test.name, time.Year(), 2010)
    345 	}
    346 	if time.Month() != February {
    347 		t.Errorf("%s: bad month: %s not %s", test.name, time.Month(), February)
    348 	}
    349 	if time.Day() != 4 {
    350 		t.Errorf("%s: bad day: %d not %d", test.name, time.Day(), 4)
    351 	}
    352 	if time.Hour() != 21 {
    353 		t.Errorf("%s: bad hour: %d not %d", test.name, time.Hour(), 21)
    354 	}
    355 	if time.Minute() != 0 {
    356 		t.Errorf("%s: bad minute: %d not %d", test.name, time.Minute(), 0)
    357 	}
    358 	if time.Second() != 57 {
    359 		t.Errorf("%s: bad second: %d not %d", test.name, time.Second(), 57)
    360 	}
    361 	// Nanoseconds must be checked against the precision of the input.
    362 	nanosec, err := strconv.ParseUint("012345678"[:test.fracDigits]+"000000000"[:9-test.fracDigits], 10, 0)
    363 	if err != nil {
    364 		panic(err)
    365 	}
    366 	if time.Nanosecond() != int(nanosec) {
    367 		t.Errorf("%s: bad nanosecond: %d not %d", test.name, time.Nanosecond(), nanosec)
    368 	}
    369 	name, offset := time.Zone()
    370 	if test.hasTZ && offset != -28800 {
    371 		t.Errorf("%s: bad tz offset: %s %d not %d", test.name, name, offset, -28800)
    372 	}
    373 	if test.hasWD && time.Weekday() != Thursday {
    374 		t.Errorf("%s: bad weekday: %s not %s", test.name, time.Weekday(), Thursday)
    375 	}
    376 }
    377 
    378 func TestFormatAndParse(t *testing.T) {
    379 	const fmt = "Mon MST " + RFC3339 // all fields
    380 	f := func(sec int64) bool {
    381 		t1 := Unix(sec/2, 0)
    382 		if t1.Year() < 1000 || t1.Year() > 9999 || t1.Unix() != sec {
    383 			// not required to work
    384 			return true
    385 		}
    386 		t2, err := Parse(fmt, t1.Format(fmt))
    387 		if err != nil {
    388 			t.Errorf("error: %s", err)
    389 			return false
    390 		}
    391 		if t1.Unix() != t2.Unix() || t1.Nanosecond() != t2.Nanosecond() {
    392 			t.Errorf("FormatAndParse %d: %q(%d) %q(%d)", sec, t1, t1.Unix(), t2, t2.Unix())
    393 			return false
    394 		}
    395 		return true
    396 	}
    397 	f32 := func(sec int32) bool { return f(int64(sec)) }
    398 	cfg := &quick.Config{MaxCount: 10000}
    399 
    400 	// Try a reasonable date first, then the huge ones.
    401 	if err := quick.Check(f32, cfg); err != nil {
    402 		t.Fatal(err)
    403 	}
    404 	if err := quick.Check(f, cfg); err != nil {
    405 		t.Fatal(err)
    406 	}
    407 }
    408 
    409 type ParseTimeZoneTest struct {
    410 	value  string
    411 	length int
    412 	ok     bool
    413 }
    414 
    415 var parseTimeZoneTests = []ParseTimeZoneTest{
    416 	{"gmt hi there", 0, false},
    417 	{"GMT hi there", 3, true},
    418 	{"GMT+12 hi there", 6, true},
    419 	{"GMT+00 hi there", 3, true}, // 0 or 00 is not a legal offset.
    420 	{"GMT-5 hi there", 5, true},
    421 	{"GMT-51 hi there", 3, true},
    422 	{"ChST hi there", 4, true},
    423 	{"MeST hi there", 4, true},
    424 	{"MSDx", 3, true},
    425 	{"MSDY", 0, false}, // four letters must end in T.
    426 	{"ESAST hi", 5, true},
    427 	{"ESASTT hi", 0, false}, // run of upper-case letters too long.
    428 	{"ESATY hi", 0, false},  // five letters must end in T.
    429 	{"WITA hi", 4, true},    // Issue #18251
    430 }
    431 
    432 func TestParseTimeZone(t *testing.T) {
    433 	for _, test := range parseTimeZoneTests {
    434 		length, ok := ParseTimeZone(test.value)
    435 		if ok != test.ok {
    436 			t.Errorf("expected %t for %q got %t", test.ok, test.value, ok)
    437 		} else if length != test.length {
    438 			t.Errorf("expected %d for %q got %d", test.length, test.value, length)
    439 		}
    440 	}
    441 }
    442 
    443 type ParseErrorTest struct {
    444 	format string
    445 	value  string
    446 	expect string // must appear within the error
    447 }
    448 
    449 var parseErrorTests = []ParseErrorTest{
    450 	{ANSIC, "Feb  4 21:00:60 2010", "cannot parse"}, // cannot parse Feb as Mon
    451 	{ANSIC, "Thu Feb  4 21:00:57 @2010", "cannot parse"},
    452 	{ANSIC, "Thu Feb  4 21:00:60 2010", "second out of range"},
    453 	{ANSIC, "Thu Feb  4 21:61:57 2010", "minute out of range"},
    454 	{ANSIC, "Thu Feb  4 24:00:60 2010", "hour out of range"},
    455 	{"Mon Jan _2 15:04:05.000 2006", "Thu Feb  4 23:00:59x01 2010", "cannot parse"},
    456 	{"Mon Jan _2 15:04:05.000 2006", "Thu Feb  4 23:00:59.xxx 2010", "cannot parse"},
    457 	{"Mon Jan _2 15:04:05.000 2006", "Thu Feb  4 23:00:59.-123 2010", "fractional second out of range"},
    458 	// issue 4502. StampNano requires exactly 9 digits of precision.
    459 	{StampNano, "Dec  7 11:22:01.000000", `cannot parse ".000000" as ".000000000"`},
    460 	{StampNano, "Dec  7 11:22:01.0000000000", "extra text: 0"},
    461 	// issue 4493. Helpful errors.
    462 	{RFC3339, "2006-01-02T15:04:05Z07:00", `parsing time "2006-01-02T15:04:05Z07:00": extra text: 07:00`},
    463 	{RFC3339, "2006-01-02T15:04_abc", `parsing time "2006-01-02T15:04_abc" as "2006-01-02T15:04:05Z07:00": cannot parse "_abc" as ":"`},
    464 	{RFC3339, "2006-01-02T15:04:05_abc", `parsing time "2006-01-02T15:04:05_abc" as "2006-01-02T15:04:05Z07:00": cannot parse "_abc" as "Z07:00"`},
    465 	{RFC3339, "2006-01-02T15:04:05Z_abc", `parsing time "2006-01-02T15:04:05Z_abc": extra text: _abc`},
    466 	// invalid second followed by optional fractional seconds
    467 	{RFC3339, "2010-02-04T21:00:67.012345678-08:00", "second out of range"},
    468 	// issue 21113
    469 	{"_2 Jan 06 15:04 MST", "4 --- 00 00:00 GMT", "cannot parse"},
    470 	{"_2 January 06 15:04 MST", "4 --- 00 00:00 GMT", "cannot parse"},
    471 }
    472 
    473 func TestParseErrors(t *testing.T) {
    474 	for _, test := range parseErrorTests {
    475 		_, err := Parse(test.format, test.value)
    476 		if err == nil {
    477 			t.Errorf("expected error for %q %q", test.format, test.value)
    478 		} else if !strings.Contains(err.Error(), test.expect) {
    479 			t.Errorf("expected error with %q for %q %q; got %s", test.expect, test.format, test.value, err)
    480 		}
    481 	}
    482 }
    483 
    484 func TestNoonIs12PM(t *testing.T) {
    485 	noon := Date(0, January, 1, 12, 0, 0, 0, UTC)
    486 	const expect = "12:00PM"
    487 	got := noon.Format("3:04PM")
    488 	if got != expect {
    489 		t.Errorf("got %q; expect %q", got, expect)
    490 	}
    491 	got = noon.Format("03:04PM")
    492 	if got != expect {
    493 		t.Errorf("got %q; expect %q", got, expect)
    494 	}
    495 }
    496 
    497 func TestMidnightIs12AM(t *testing.T) {
    498 	midnight := Date(0, January, 1, 0, 0, 0, 0, UTC)
    499 	expect := "12:00AM"
    500 	got := midnight.Format("3:04PM")
    501 	if got != expect {
    502 		t.Errorf("got %q; expect %q", got, expect)
    503 	}
    504 	got = midnight.Format("03:04PM")
    505 	if got != expect {
    506 		t.Errorf("got %q; expect %q", got, expect)
    507 	}
    508 }
    509 
    510 func Test12PMIsNoon(t *testing.T) {
    511 	noon, err := Parse("3:04PM", "12:00PM")
    512 	if err != nil {
    513 		t.Fatal("error parsing date:", err)
    514 	}
    515 	if noon.Hour() != 12 {
    516 		t.Errorf("got %d; expect 12", noon.Hour())
    517 	}
    518 	noon, err = Parse("03:04PM", "12:00PM")
    519 	if err != nil {
    520 		t.Fatal("error parsing date:", err)
    521 	}
    522 	if noon.Hour() != 12 {
    523 		t.Errorf("got %d; expect 12", noon.Hour())
    524 	}
    525 }
    526 
    527 func Test12AMIsMidnight(t *testing.T) {
    528 	midnight, err := Parse("3:04PM", "12:00AM")
    529 	if err != nil {
    530 		t.Fatal("error parsing date:", err)
    531 	}
    532 	if midnight.Hour() != 0 {
    533 		t.Errorf("got %d; expect 0", midnight.Hour())
    534 	}
    535 	midnight, err = Parse("03:04PM", "12:00AM")
    536 	if err != nil {
    537 		t.Fatal("error parsing date:", err)
    538 	}
    539 	if midnight.Hour() != 0 {
    540 		t.Errorf("got %d; expect 0", midnight.Hour())
    541 	}
    542 }
    543 
    544 // Check that a time without a Zone still produces a (numeric) time zone
    545 // when formatted with MST as a requested zone.
    546 func TestMissingZone(t *testing.T) {
    547 	time, err := Parse(RubyDate, "Thu Feb 02 16:10:03 -0500 2006")
    548 	if err != nil {
    549 		t.Fatal("error parsing date:", err)
    550 	}
    551 	expect := "Thu Feb  2 16:10:03 -0500 2006" // -0500 not EST
    552 	str := time.Format(UnixDate)               // uses MST as its time zone
    553 	if str != expect {
    554 		t.Errorf("got %s; expect %s", str, expect)
    555 	}
    556 }
    557 
    558 func TestMinutesInTimeZone(t *testing.T) {
    559 	time, err := Parse(RubyDate, "Mon Jan 02 15:04:05 +0123 2006")
    560 	if err != nil {
    561 		t.Fatal("error parsing date:", err)
    562 	}
    563 	expected := (1*60 + 23) * 60
    564 	_, offset := time.Zone()
    565 	if offset != expected {
    566 		t.Errorf("ZoneOffset = %d, want %d", offset, expected)
    567 	}
    568 }
    569 
    570 type SecondsTimeZoneOffsetTest struct {
    571 	format         string
    572 	value          string
    573 	expectedoffset int
    574 }
    575 
    576 var secondsTimeZoneOffsetTests = []SecondsTimeZoneOffsetTest{
    577 	{"2006-01-02T15:04:05-070000", "1871-01-01T05:33:02-003408", -(34*60 + 8)},
    578 	{"2006-01-02T15:04:05-07:00:00", "1871-01-01T05:33:02-00:34:08", -(34*60 + 8)},
    579 	{"2006-01-02T15:04:05-070000", "1871-01-01T05:33:02+003408", 34*60 + 8},
    580 	{"2006-01-02T15:04:05-07:00:00", "1871-01-01T05:33:02+00:34:08", 34*60 + 8},
    581 	{"2006-01-02T15:04:05Z070000", "1871-01-01T05:33:02-003408", -(34*60 + 8)},
    582 	{"2006-01-02T15:04:05Z07:00:00", "1871-01-01T05:33:02+00:34:08", 34*60 + 8},
    583 	{"2006-01-02T15:04:05-07", "1871-01-01T05:33:02+01", 1 * 60 * 60},
    584 	{"2006-01-02T15:04:05-07", "1871-01-01T05:33:02-02", -2 * 60 * 60},
    585 	{"2006-01-02T15:04:05Z07", "1871-01-01T05:33:02-02", -2 * 60 * 60},
    586 }
    587 
    588 func TestParseSecondsInTimeZone(t *testing.T) {
    589 	// should accept timezone offsets with seconds like: Zone America/New_York   -4:56:02 -      LMT     1883 Nov 18 12:03:58
    590 	for _, test := range secondsTimeZoneOffsetTests {
    591 		time, err := Parse(test.format, test.value)
    592 		if err != nil {
    593 			t.Fatal("error parsing date:", err)
    594 		}
    595 		_, offset := time.Zone()
    596 		if offset != test.expectedoffset {
    597 			t.Errorf("ZoneOffset = %d, want %d", offset, test.expectedoffset)
    598 		}
    599 	}
    600 }
    601 
    602 func TestFormatSecondsInTimeZone(t *testing.T) {
    603 	for _, test := range secondsTimeZoneOffsetTests {
    604 		d := Date(1871, 1, 1, 5, 33, 2, 0, FixedZone("LMT", test.expectedoffset))
    605 		timestr := d.Format(test.format)
    606 		if timestr != test.value {
    607 			t.Errorf("Format = %s, want %s", timestr, test.value)
    608 		}
    609 	}
    610 }
    611 
    612 // Issue 11334.
    613 func TestUnderscoreTwoThousand(t *testing.T) {
    614 	format := "15:04_20060102"
    615 	input := "14:38_20150618"
    616 	time, err := Parse(format, input)
    617 	if err != nil {
    618 		t.Error(err)
    619 	}
    620 	if y, m, d := time.Date(); y != 2015 || m != 6 || d != 18 {
    621 		t.Errorf("Incorrect y/m/d, got %d/%d/%d", y, m, d)
    622 	}
    623 	if h := time.Hour(); h != 14 {
    624 		t.Errorf("Incorrect hour, got %d", h)
    625 	}
    626 	if m := time.Minute(); m != 38 {
    627 		t.Errorf("Incorrect minute, got %d", m)
    628 	}
    629 }
    630