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datetime.go
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datetime.go
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package php
import (
"errors"
"fmt"
"regexp"
"strconv"
"strings"
"time"
)
// Time returns current Unix timestamp
func Time() int64 {
return time.Now().Unix()
}
// Microtime returns current Unix timestamp with microseconds
func Microtime() float64 {
return Round(float64(time.Now().UnixNano())/1000000000, 4)
}
// Strtotime parses any English textual datetime description into a Unix timestamp,
// default timezone is UTC if you do not specify one
//
// e.g. You can specify the timezone to UTC+8 by using yyyy-MM-ddThh:mm:ss+08:00
//
// Returns a timestamp on success, -1 on failure.
//
// Note that this function does not fully cover PHP's strtotime function yet
func Strtotime(str string) int64 {
t, err := DateCreate(str)
if err != nil {
return -1
}
return t.Unix()
}
// IsLeapYear checks if the given time is in a leap year
func IsLeapYear(t time.Time) bool {
t2 := time.Date(t.Year(), time.December, 31, 0, 0, 0, 0, time.UTC)
return t2.YearDay() == 366
}
// LastDateOfMonth gets the last date of the month which the given time is in
func LastDateOfMonth(t time.Time) time.Time {
t2 := FirstDateOfNextMonth(t)
return time.Unix(t2.Unix()-86400, 0)
}
// FirstDateOfMonth gets the first date of the month which the given time is in
func FirstDateOfMonth(t time.Time) time.Time {
year, month, _ := t.Date()
return time.Date(year, month, 1, 0, 0, 0, 0, time.UTC)
}
// FirstDateOfNextMonth gets the first date of next month
func FirstDateOfNextMonth(t time.Time) time.Time {
year, month, _ := t.Date()
if month == time.December {
year++
month = time.January
} else {
month++
}
return time.Date(year, month, 1, 0, 0, 0, 0, time.UTC)
}
// FirstDateOfLastMonth gets the first date of last month
func FirstDateOfLastMonth(t time.Time) time.Time {
year, month, _ := t.Date()
if month == time.January {
year--
month = time.December
} else {
month--
}
return time.Date(year, month, 1, 0, 0, 0, 0, time.UTC)
}
// recognize the character in the php date/time format string
func recognize(c string, t time.Time) string {
switch c {
// Day
case "d": // Day of the month, 2 digits with leading zeros
return fmt.Sprintf("%02d", t.Day())
case "D": // A textual representation of a day, three letters
return t.Format("Mon")
case "j": // Day of the month without leading zeros
return fmt.Sprintf("%d", t.Day())
case "l": // A full textual representation of the day of the week
return t.Weekday().String()
case "w": // Numeric representation of the day of the week
return fmt.Sprintf("%d", t.Weekday())
case "z": // The day of the year (starting from 0)
return fmt.Sprintf("%v", t.YearDay()-1)
// Week
case "W": // ISO-8601 week number of year, weeks starting on Monday
_, w := t.ISOWeek()
return fmt.Sprintf("%d", w)
// Month
case "F": // A full textual representation of a month
return t.Month().String()
case "m": // Numeric representation of a month, with leading zeros
return fmt.Sprintf("%02d", t.Month())
case "M": // A short textual representation of a month, three letters
return t.Format("Jan")
case "n": // Numeric representation of a month, without leading zeros
return fmt.Sprintf("%d", t.Month())
case "t": // Number of days in the given month
return LastDateOfMonth(t).Format("2")
// Year
case "L": // Whether it's a leap year
if IsLeapYear(t) {
return "1"
}
return "0"
case "o":
fallthrough
case "Y": // A full numeric representation of a year, 4 digits
return fmt.Sprintf("%v", t.Year())
case "y": // A two digit representation of a year
return t.Format("06")
// Time
case "a": // Lowercase Ante meridiem and Post meridiem
return t.Format("pm")
case "A": // Uppercase Ante meridiem and Post meridiem
return strings.ToUpper(t.Format("pm"))
case "g": // 12-hour format of an hour without leading zeros
return t.Format("3")
case "G": // 24-hour format of an hour without leading zeros
return fmt.Sprintf("%d", t.Hour())
case "h": // 12-hour format of an hour with leading zeros
return t.Format("03")
case "H": // 24-hour format of an hour with leading zeros
return fmt.Sprintf("%02d", t.Hour())
case "i": // Minutes with leading zeros
return fmt.Sprintf("%02d", t.Minute())
case "s": // Seconds, with leading zeros
return fmt.Sprintf("%02d", t.Second())
case "e": // Timezone identifier
fallthrough
case "T": // Timezone abbreviation
return t.Format("MST")
case "O": // Difference to Greenwich time (GMT) in hours
return t.Format("-0700")
case "P": // Difference to Greenwich time (GMT) with colon between hours and minutes
return t.Format("-07:00")
case "U": // Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)
return fmt.Sprintf("%v", t.Unix())
default:
return c
}
}
// parse returns a textual representation of the time value formatted
// according to the given php date/time format string
func parse(format string, t time.Time) string {
result := ""
for _, s := range format {
result += recognize(string(s), t)
}
return result
}
// format is a wrapper of parse
func format(f string, t time.Time) string {
pattern, err := getPattern(f)
if err != nil {
return parse(f, t)
}
return t.Format(pattern.layout)
}
// Date returns a string formatted according to the given format string using the given integer timestamp
//
// Note that the timezone is set to UTC
func Date(f string, timestamp int64) string {
return format(f, time.Unix(timestamp, 0).UTC())
}
// Today returns a string formatted according to the given format string using current timestamp
//
// Note that the timezone is using local timezone
func Today(f string) string {
return format(f, time.Now())
}
// LocalDate returns a string formatted according to the given format string using the given integer timestamp
//
// Note that the timezone is using local timezone
func LocalDate(f string, timestamp int64) string {
return format(f, time.Unix(timestamp, 0))
}
// Checkdate validates a Gregorian date
func Checkdate(month, day, year int) bool {
if month < 1 || month > 12 || day < 1 || day > 31 || year <= 0 {
return false
}
_, err := time.Parse("2006-1-2", fmt.Sprintf("%04d-%d-%d", year, month, day))
return err == nil
}
// DateCreateFromFormat parses a date/time string according to a specified format
func DateCreateFromFormat(f string, t string) (time.Time, error) {
return time.Parse(convertLayout(f), t)
}
// DateCreate parses a date/time string and return a time.Time.
// Supported Date and Time Formats: https://www.php.net/manual/en/datetime.formats.php
func DateCreate(str string) (time.Time, error) {
if strings.ToLower(str) == "now" {
return time.Now(), nil
}
duration, err := DateIntervalCreateFromDateString(str)
if err == nil {
return time.Now().Add(duration), nil
}
for _, p := range _defaultPatterns {
reg := regexp.MustCompile(p.regexp)
if reg.MatchString(str) {
t, err := time.Parse(p.layout, str)
if err == nil {
return t, nil
}
}
}
return time.Time{}, errors.New("Unsupported date/time string: " + str)
}
// DateDateSet sets the date by year, month and day
func DateDateSet(year, month, day int) (time.Time, error) {
return time.Parse("2006-1-2", fmt.Sprintf("%04d-%d-%d", year, month, day))
}
// DateDefaultTimezoneGet gets the default timezone
func DateDefaultTimezoneGet() string {
tz, _ := time.Now().Local().Zone()
return tz
}
// DateDefaultTimezoneSet sets the default timezone
func DateDefaultTimezoneSet(tz string) error {
loc, err := time.LoadLocation(tz)
if err != nil {
return err
}
time.Local = loc
return nil
}
// DateTimezoneGet gets the timezone of the given time
func DateTimezoneGet(t time.Time) string {
tz, _ := t.Zone()
return tz
}
// DateTimezoneSet returns a copy of t with the given timezone
func DateTimezoneSet(t time.Time, tz string) (time.Time, error) {
loc, err := time.LoadLocation(tz)
if err != nil {
return t, err
}
return t.In(loc), nil
}
// DateDiff returns the difference between two times (t2 - t1)
func DateDiff(t1 time.Time, t2 time.Time) time.Duration {
return t2.Sub(t1)
}
// DateFormat returns a string formatted according to the given format string using the given time
func DateFormat(t time.Time, f string) string {
return format(f, t)
}
// DateIntervalCreateFromDateString returns a time.Duration from the given string
func DateIntervalCreateFromDateString(str string) (time.Duration, error) {
reg := regexp.MustCompile("((\\+|\\-)?\\s*(\\d*)\\s*(day|month|year|week|hour|minute|second)s?\\s*)+?")
matches := reg.FindAllStringSubmatch(str, -1)
if matches != nil {
var duration int64
for _, match := range matches {
var diff, num int64
if match[3] == "" {
num = 1
} else {
num, _ = strconv.ParseInt(match[3], 10, 64)
}
switch match[4] {
case "day":
diff = num * 86400
case "month":
diff = num * 86400 * 30
case "year":
diff = num * 86400 * 365
case "week":
diff = num * 86400 * 7
case "hour":
diff = num * 3600
case "minute":
diff = num * 60
case "second":
diff = num
}
if match[2] == "-" {
diff = -diff
}
duration += diff
}
return time.Duration(duration) * time.Second, nil
}
return 0, errors.New("unsupported string format")
}
// DateISODateSet sets a date according to the ISO 8601 standard - using weeks and day offsets rather than specific dates
func DateISODateSet(year, week, day int) (time.Time, error) {
firstDateOfYear, err := time.Parse("2006-1-2", fmt.Sprintf("%04d-%d-%d", year, 1, 1))
if err != nil {
return time.Time{}, err
}
offset := time.Duration(1-firstDateOfYear.Weekday()) * 24 * time.Hour
firstDateOfFirstWeek := firstDateOfYear.Add(offset)
return firstDateOfFirstWeek.Add(time.Duration(((week-1)*7+day-1)*24) * time.Hour), nil
}
// DateModify alter the time by the given format
func DateModify(t time.Time, modify string) (time.Time, error) {
duration, err := DateIntervalCreateFromDateString(modify)
if err != nil {
return t, err
}
return t.Add(duration), nil
}
// DateOffsetGet returns the timezone offset
func DateOffsetGet(t time.Time) int {
_, offset := t.Zone()
return offset
}
// DateAdd adds an amount of days, months, years, hours, minutes and seconds to the time t
func DateAdd(t time.Time, d time.Duration) time.Time {
return t.Add(d)
}
// DateSub subtracts an amount of days, months, years, hours, minutes and seconds from the time t
func DateSub(t time.Time, d time.Duration) time.Time {
return t.Add(-d)
}
// DateTimestampGet gets the Unix timestamp
func DateTimestampGet(t time.Time) int64 {
return t.Unix()
}
// DateTimestampSet sets the date and time based on an Unix timestamp
func DateTimestampSet(timestamp int64) time.Time {
return time.Unix(timestamp, 0)
}