dtfmt

Documentation

Overview

dtfmt package provides time formatter support with pattern syntax mostly similar to joda DateTimeFormat. The pattern syntax supported is a subset (mostly compatible) with joda DateTimeFormat.

Symbol  Meaning                      Type     Supported Examples
------  -------                      -------  --------- -------
G       era                          text      no       AD
C       century of era (>=0)      number    no       20
Y       year of era (>=0)         year      yes      1996

x       weekyear                     year      yes      1996
w       week of weekyear             number    yes      27
e       day of week                  number    yes      2
E       day of week                  text      yes      Tuesday; Tue

y       year                         year      yes      1996
D       day of year                  number    yes      189
M       month of year                month     yes      July; Jul; 07
d       day of month                 number    yes      10

a       halfday of day               text      yes      PM
K       hour of halfday (0~11)       number    yes      0
h       clockhour of halfday (1~12)  number    yes      12

H       hour of day (0~23)           number    yes      0
k       clockhour of day (1~24)      number    yes      24
m       minute of hour               number    yes      30
s       second of minute             number    yes      55
S       fraction of second           millis    no       978

z       time zone                    text      no       Pacific Standard Time; PST
Z       time zone offset/id          zone      no       -0800; -08:00; America/Los_Angeles

'       escape for text              delimiter
''      single quote                 literal

The format is based on pattern letter count. Any character not in the range [a-z][A-Z] is interpreted as literal and copied into final string as is. Arbitrary Literals can also be written using single quotes `'`

Types:          Notes:
------          ------
 text           Use full form if number of letters is >= 4.
                Otherwise a short form is used (if available).

 number         Minimum number of digits depends on number of letters.
                Shorter numbers are zero-padded.

 year           mostly like number. If Pattern length is 2,
                the year will be displayed as zero-based year
                of the century (modulo 100)

 month          If pattern length >= 3, formatting is according to
                text type. Otherwise number type
                formatting rules are applied.

 millis         Not yet supported

 zone           Not yet supported

 literal        Literals are copied as is into formatted string

Index

• func Format(t time.Time, pattern string) (string, error)
• type Formatter
  • func NewFormatter(pattern string) (*Formatter, error)
  • func (f *Formatter) AppendTo(b []byte, t time.Time) ([]byte, error)
  • func (f *Formatter) EstimateSize() int
  • func (f *Formatter) Format(t time.Time) (string, error)
  • func (f *Formatter) Write(w io.Writer, t time.Time) (int, error)

Functions

func Format

func Format(t time.Time, pattern string) (string, error)

Format applies the format-pattern to the given timestamp. Returns the formatted string or an error if pattern is invalid.

Types

type Formatter

type Formatter struct {
	// contains filtered or unexported fields
}

Formatter will format time values into strings, based on pattern used to create the Formatter.

func NewFormatter

func NewFormatter(pattern string) (*Formatter, error)

NewFormatter creates a new time formatter based on provided pattern. If pattern is invalid an error is returned.

func (*Formatter) AppendTo

func (f *Formatter) AppendTo(b []byte, t time.Time) ([]byte, error)

AppendTo appends the formatted time value to the given byte buffer.

func (*Formatter) EstimateSize

func (f *Formatter) EstimateSize() int

EstimateSize estimates the required buffer size required to hold the formatted time string. Estimated size gives no exact guarantees. Estimated size might still be too low or too big.

func (*Formatter) Format

func (f *Formatter) Format(t time.Time) (string, error)

Format formats the given time value into a new string.

func (*Formatter) Write

func (f *Formatter) Write(w io.Writer, t time.Time) (int, error)

Write writes the formatted time value to the given writer. Returns number of bytes written or error if formatter or writer fails.