github.com/kaydxh/golang@v0.0.131/go/time/time.go (about)

     1  /*
     2   *Copyright (c) 2022, kaydxh
     3   *
     4   *Permission is hereby granted, free of charge, to any person obtaining a copy
     5   *of this software and associated documentation files (the "Software"), to deal
     6   *in the Software without restriction, including without limitation the rights
     7   *to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   *copies of the Software, and to permit persons to whom the Software is
     9   *furnished to do so, subject to the following conditions:
    10   *
    11   *The above copyright notice and this permission notice shall be included in all
    12   *copies or substantial portions of the Software.
    13   *
    14   *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   *SOFTWARE.
    21   */
    22  package time
    23  
    24  import "time"
    25  
    26  const (
    27  	DayFormat             = "20060102"
    28  	TimeMillFormat        = "20060102150405.000"
    29  	ShortTimeFormat       = "20060102150405"
    30  	ShortDashTimeFormat   = "2006-01-02-15:04:05"
    31  	DefaultTimeFormat     = "2006-01-02 15:04:05"
    32  	DefaultTimeMillFormat = "2006-01-02 15:04:05.000"
    33  )
    34  
    35  func Now() time.Time {
    36  	now := time.Now()
    37  	return now
    38  }
    39  
    40  func NowString(layout string) string {
    41  	tm := Now()
    42  	if layout == "" {
    43  		layout = DefaultTimeFormat
    44  	}
    45  
    46  	return tm.Format(layout)
    47  }
    48  
    49  func BeginningOfDay(days int) time.Time {
    50  	now := time.Now()
    51  	theDay := now.AddDate(0, 0, days)
    52  	y, m, d := theDay.Date()
    53  	return time.Date(y, m, d, 0, 0, 0, 0, theDay.Location())
    54  }
    55  
    56  func BeginningOfDayString(days int, layout string) string {
    57  	now := time.Now()
    58  	theDay := now.AddDate(0, 0, days)
    59  	y, m, d := theDay.Date()
    60  
    61  	if layout == "" {
    62  		layout = DefaultTimeFormat
    63  	}
    64  	return time.Date(y, m, d, 0, 0, 0, 0, theDay.Location()).Format(layout)
    65  }
    66  
    67  func EndOfDay(days int) time.Time {
    68  	now := time.Now()
    69  	theDay := now.AddDate(0, 0, days)
    70  	y, m, d := theDay.Date()
    71  	return time.Date(y, m, d, 23, 59, 59, int(time.Second-time.Nanosecond), theDay.Location())
    72  }
    73  
    74  func EndOfDayString(days int, layout string) string {
    75  	now := time.Now()
    76  	theDay := now.AddDate(0, 0, days)
    77  	y, m, d := theDay.Date()
    78  
    79  	if layout == "" {
    80  		layout = DefaultTimeFormat
    81  	}
    82  	return time.Date(
    83  		y,
    84  		m,
    85  		d,
    86  		23,
    87  		59,
    88  		59,
    89  		int(time.Second-time.Nanosecond),
    90  		theDay.Location(),
    91  	).Format(layout)
    92  }
    93  
    94  // Truncate only happens in UTC semantics, apparently.
    95  // observed values for truncating given time with 86400 secs:
    96  //
    97  // before truncation: 2018/06/01 03:54:54 2018-06-01T03:18:00+09:00
    98  // after  truncation: 2018/06/01 03:54:54 2018-05-31T09:00:00+09:00
    99  //
   100  // This is really annoying when we want to truncate in local time
   101  // so we hack: we take the apparent local time in the local zone,
   102  // and pretend that it's in UTC. do our math, and put it back to
   103  // the local zone
   104  func TruncateToUTC(t time.Time, d time.Duration) time.Time {
   105  	if t.Location() == time.UTC {
   106  		return t.Truncate(d)
   107  	}
   108  
   109  	base := time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), time.UTC)
   110  	base = base.Truncate(d)
   111  
   112  	return time.Date(
   113  		base.Year(),
   114  		base.Month(),
   115  		base.Day(),
   116  		base.Hour(),
   117  		base.Minute(),
   118  		base.Second(),
   119  		base.Nanosecond(),
   120  		base.Location(),
   121  	)
   122  }
   123  
   124  func TruncateToUTCString(t time.Time, d time.Duration, layout string) string {
   125  	utc := TruncateToUTC(t, d)
   126  
   127  	if layout == "" {
   128  		layout = DefaultTimeFormat
   129  	}
   130  
   131  	return utc.Format(layout)
   132  }