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dates.go
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dates.go
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package utils
import (
"errors"
"strconv"
"time"
)
// StrToUnixtime converts a string corresponding to an int to Unix time
func StrToUnixtime(s string) (t time.Time, err error) {
i, err := strconv.ParseInt(s, 10, 64)
if err != nil {
return
}
t = time.Unix(i, 0)
return
}
// CheckWeekDay returns true if @date is not weekend and false otherwise.
func CheckWeekDay(date time.Time) bool {
if date.Weekday() == time.Saturday || date.Weekday() == time.Sunday {
return false
}
return true
}
// ContainsDay returns true if day @date is contained in slice @s, independent of the daytime.
// As a consequence, be cautious when comparing days in different timezones.
func ContainsDay(s []time.Time, date time.Time) bool {
for _, a := range s {
if SameDays(a, date) {
return true
}
}
return false
}
// SameDays returns true if @date1 is the same date as @date2, independent of the daytime.
func SameDays(date1, date2 time.Time) bool {
if date1.Year() == date2.Year() && date1.Month() == date2.Month() && date1.Day() == date2.Day() {
return true
}
return false
}
// AfterDay returns true if date1 is a date after date2, irrespective of the daytime.
// The go method "After" respects daytime.
func AfterDay(date1, date2 time.Time) bool {
date1Str := date1.Format("2006-01-02")
date2Str := date2.Format("2006-01-02")
return date1Str > date2Str
}
// CountDays returns the number of days between
// @dateInit and @dateFinal, both given as converted from a string in the format yyyy-mm-dd, excluding the last day.
// @bool If true only business days are counted.
func CountDays(dateInit, dateFinal time.Time, business bool) (days int, err error) {
if SameDays(dateInit, dateFinal) {
return 0, nil
}
days = 0
if dateInit.After(dateFinal) {
log.Error("The final date cannot be smaller than the initial date.")
err = errors.New("date error")
return
}
for {
if SameDays(dateInit, dateFinal) {
return days, nil
}
if business {
if CheckWeekDay(dateInit) {
days++
}
dateInit = dateInit.Add(time.Hour * 24)
} else {
days++
dateInit = dateInit.Add(time.Hour * 24)
}
}
}
// GetHolidays returns "holidays" as non-weekend complement of given days @workdays
func GetHolidays(workdays []time.Time, dateInit, dateFinal time.Time) []time.Time {
if AfterDay(dateInit, dateFinal) {
log.Error("The initial date must not be after the final date.")
return []time.Time{}
}
auxDate := dateInit
holidays := []time.Time{}
for !SameDays(auxDate, dateFinal.AddDate(0, 0, 1)) {
if CheckWeekDay(auxDate) && !ContainsDay(workdays, auxDate) {
holidays = append(holidays, auxDate)
auxDate = auxDate.AddDate(0, 0, 1)
} else {
auxDate = auxDate.AddDate(0, 0, 1)
}
}
return holidays
}
// GetYesterday returns the day before @date in the world of strings, formatted as @layout
func GetYesterday(date, layout string) string {
dateTime, err := time.Parse(layout, date)
if err != nil {
log.Printf("Error: %v on date format %s\n", err, date)
}
yesterday := dateTime.AddDate(0, 0, -1)
return yesterday.Format(layout)
}
// GetTomorrow returns the day before @date in the world of strings, formatted as @layout
func GetTomorrow(date, layout string) string {
dateTime, err := time.Parse(layout, date)
if err != nil {
log.Printf("Error: %v on date format %s\n", err, date)
}
tomorrow := dateTime.AddDate(0, 0, 1)
return tomorrow.Format(layout)
}
// MakeTimeRanges returns @numRanges start- and endtimes partitioning [@timeInit, @timeFinal] in intervals of identical size.
func MakeTimeRanges(timeInit, timeFinal time.Time, numRanges int) (starttimes, endtimes []time.Time) {
a := timeInit
b := timeFinal
totalSize := b.Sub(a)
sizeRange := totalSize / time.Duration(numRanges)
starttime := timeInit
for k := 0; k < numRanges; k++ {
starttimes = append(starttimes, starttime)
endtimes = append(endtimes, starttime.Add(sizeRange))
starttime = starttime.Add(sizeRange)
}
return
}
// MakeTimerange parses Unix timestamps given as strings.
// In case one of the two is empty, it returns a time-range based on @timeRange.
// Default is a 24h window ending now.
func MakeTimerange(starttimeString string, endtimeString string, timeRange time.Duration) (starttime time.Time, endtime time.Time, err error) {
var (
starttimeInt int64
endtimeInt int64
)
if starttimeString == "" && endtimeString == "" {
endtime = time.Now()
starttime = endtime.Add(-timeRange)
} else if starttimeString == "" && endtimeString != "" {
// zero time if not given
endtimeInt, err = strconv.ParseInt(endtimeString, 10, 64)
if err != nil {
return
}
endtime = time.Unix(endtimeInt, 0)
starttime = endtime.Add(-timeRange)
} else if starttimeString != "" && endtimeString == "" {
starttimeInt, err = strconv.ParseInt(starttimeString, 10, 64)
if err != nil {
return
}
starttime = time.Unix(starttimeInt, 0)
endtime = starttime.Add(timeRange)
} else {
starttimeInt, err = strconv.ParseInt(starttimeString, 10, 64)
if err != nil {
return
}
starttime = time.Unix(starttimeInt, 0)
endtimeInt, err = strconv.ParseInt(endtimeString, 10, 64)
if err != nil {
return
}
endtime = time.Unix(endtimeInt, 0)
}
return starttime, endtime, nil
}
// ValidTimeRange returns true if the interval [@starttime, @endtime] is at most @maxDuration.
func ValidTimeRange(starttime time.Time, endtime time.Time, maxDuration time.Duration) (ok bool) {
if endtime.Sub(starttime) <= maxDuration {
ok = true
}
return
}