worklog/internal/tools/datetime.go

package tools

import (
	"strconv"
	"strings"
	"time"
)

// exported function(s)
func TimeToDDMMYYYY(time time.Time) string {
	tmp := strconv.Itoa(time.Year())
	for len(tmp) < 4 {
		tmp = "0" + tmp
	}
	tmp = "." + tmp
	tmp = strconv.Itoa(int(time.Month())) + tmp
	for len(tmp) < 7 {
		tmp = "0" + tmp
	}
	tmp = "." + tmp
	tmp = strconv.Itoa(time.Day()) + tmp
	for len(tmp) < 10 {
		tmp = "0" + tmp
	}
	return tmp

}

func TimeToHHMMSS(time time.Time) string {
	if time == ZeroDate {
		return ""
	}
	tmp := strconv.Itoa(time.Second())
	if len(tmp) < 2 {
		tmp = "0" + tmp
	}
	tmp = ":" + tmp
	tmp = strconv.Itoa(time.Minute()) + tmp
	for len(tmp) < 5 {
		tmp = "0" + tmp
	}
	tmp = ":" + tmp
	tmp = strconv.Itoa(time.Hour()) + tmp
	for len(tmp) < 8 {
		tmp = "0" + tmp
	}
	return tmp
}

func DurationToHHMMSS(duration time.Duration) string {
	negative := false
	if duration < 0 {
		duration = duration * -1
		negative = true
	}
	durationSeconds := duration.Seconds()
	durationHours := int(durationSeconds / 3600)
	if durationHours > 0 {
		durationSeconds = durationSeconds - float64(durationHours)*3600
	}
	durationMinutes := int(durationSeconds / 60)
	if durationMinutes > 0 {
		durationSeconds = durationSeconds - float64(durationMinutes)*60
	}
	tmpDuration := strconv.Itoa(int(durationSeconds))
	for len(tmpDuration) < 2 {
		tmpDuration = "0" + tmpDuration
	}
	tmpDuration = ":" + tmpDuration
	tmpDuration = strconv.Itoa(int(durationMinutes)) + tmpDuration
	for len(tmpDuration) < 5 {
		tmpDuration = "0" + tmpDuration
	}
	tmpDuration = ":" + tmpDuration
	tmpDuration = strconv.Itoa(int(durationHours)) + tmpDuration
	for len(tmpDuration) < 8 {
		tmpDuration = "0" + tmpDuration
	}
	if negative {
		tmpDuration = "-" + tmpDuration
	}
	return tmpDuration
}

func DDMMYYToDate(date string) (time.Time, error) {
	returnDate := time.Date(1, 1, 1, 0, 0, 0, 0, time.UTC)
	if len(date) == 0 {
		return returnDate, nil
	}
	parts := strings.Split(date, ".")
	if len(parts) < 3 {
		return returnDate, nil
	}
	days := 0
	months := 0
	years := 0
	for index := 0; index < 3; index++ {
		tmp, error := strconv.Atoi(parts[index])
		if error != nil {
			return returnDate, error
		}
		switch index {
		case 0:
			days = tmp
			continue
		case 1:
			months = tmp
			continue
		case 2:
			years = tmp
			continue
		}
	}
	returnDate = returnDate.AddDate(years-1, months-1, days-1)
	return returnDate, nil
}