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dtg.go
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dtg.go
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package models
import (
"regexp"
"strings"
"time"
"github.com/pkg/errors"
)
const (
ParseAcp121Full = "021504 Jan 2006"
FormatAcp121Full = "021504MST Jan 2006"
ParseAcp121Short = "021504"
FormatAcp121Short = "021504MST"
Acp121Date = "_2 Jan 2006"
ParseAcp121Time = "1504"
FormatAcp121Time = "1504MST"
)
var AcpTimeZonesByOffset = map[int]string{
1: "A", 2: "B", 3: "C", 4: "D", 5: "E", 6: "F", 7: "G", 8: "H", 9: "I", 10: "K", 11: "L", 12: "M",
-1: "N", -2: "O", -3: "P", -4: "Q", -5: "R", -6: "S", -7: "T", -8: "U", -9: "V", -10: "W", -11: "X", -12: "Y",
0: "Z",
}
var AcpTimeZonesByLetter = map[string]int{
"A": 1, "B": 2, "C": 3, "D": 4, "E": 5, "F": 6, "G": 7, "H": 8, "I": 9, "K": 10, "L": 11, "M": 12,
"N": -1, "O": -2, "P": -3, "Q": -4, "R": -5, "S": -6, "T": -7, "U": -8, "V": -9, "W": -10, "X": -11, "Y": -12,
"Z": 0,
}
func AcpLocation(offset int) *time.Location {
return time.FixedZone(AcpTimeZonesByOffset[offset], offset*3600)
}
func ParseAcpTimeZone(tz string) (*time.Location, error) {
if len(tz) != 1 {
return nil, errors.Errorf("%s is not a valid ACP 121 timezone designator", tz)
}
offset, ok := AcpTimeZonesByLetter[strings.ToUpper(tz)]
if !ok {
return nil, errors.Errorf("%s is not a valid ACP 121 timezone designator", tz)
}
return AcpLocation(offset), nil
}
type Dtg struct {
datetime time.Time
}
func (d Dtg) Full() string {
return d.datetime.Format(FormatAcp121Full)
}
func (d Dtg) Short() string {
return d.datetime.Format(FormatAcp121Short)
}
func (d Dtg) Date() string {
return d.datetime.Format(Acp121Date)
}
func (d Dtg) Time() string {
return d.datetime.Format(FormatAcp121Time)
}
func (d Dtg) IsoDate() string {
return d.datetime.Format("2006-01-02")
}
func (d Dtg) Hour() int {
return d.datetime.Hour()
}
func (d Dtg) Unix() int64 {
return d.datetime.Unix()
}
func DtgNow(tzoffset int) Dtg {
l := AcpLocation(tzoffset)
d := time.Now().In(l)
return Dtg{d}
}
func ParseDtg(dtg string) (Dtg, error) {
r := regexp.MustCompile(`(\d{4,6})([[:alpha:]]).*`)
match := r.FindStringSubmatch(dtg)
if len(match) == 4 {
l, err := ParseAcpTimeZone(match[2])
if err != nil {
return Dtg{}, errors.WithStack(err)
}
d := match[1] + match[3]
// Try full
dt, err := time.ParseInLocation(ParseAcp121Full, d, l)
if err == nil {
return Dtg{dt}, nil
}
// Try short
dt, err = time.ParseInLocation(ParseAcp121Short, d, l)
if err == nil {
return Dtg{dt}, nil
}
// Try time
// Try short
dt, err = time.ParseInLocation(ParseAcp121Short, d, l)
if err != nil {
return Dtg{}, errors.WithMessagef(err, "failed to parse %s as an ACP DTG", dtg)
}
return Dtg{dt}, nil
}
dt, err := time.Parse(Acp121Date, dtg)
if err != nil {
return Dtg{}, errors.WithMessagef(err, "failed to parse %s as an ACP date", dtg)
}
return Dtg{dt}, nil
}
func ParseIsoDateTimeToDtg(iso string, tzoffset int) (Dtg, error) {
location := AcpLocation(tzoffset)
dt, err := time.Parse(time.RFC3339, iso)
if err != nil {
dt, err = time.Parse("2006-01-02T15:04:05", iso)
if err != nil {
return Dtg{}, errors.WithMessagef(err, "failed to parse %s as an ISO date-time", iso)
}
}
localized := dt.In(location)
return Dtg{localized}, nil
}
func ParseIsoDateToDtg(iso string) (Dtg, error) {
dt, err := time.Parse("2006-01-02", iso)
if err != nil {
return Dtg{}, errors.WithMessagef(err, "failed to parse %s as an ISO date", iso)
}
return Dtg{dt}, nil
}
func ParseTimeToDtg(t string, tzoffset int) (Dtg, error) {
location := AcpLocation(tzoffset)
var dt time.Time
dt, err := time.ParseInLocation("15:04:05", t, location)
if err != nil {
dt, err = time.ParseInLocation("15:04", t, location)
if err != nil {
return Dtg{}, errors.WithMessagef(err, "failed to parse %s as a time", t)
}
}
return Dtg{dt}, nil
}