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time.go
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time.go
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package api
import (
"fmt"
"strconv"
"strings"
"time"
"github.com/evanoberholster/exiftools/exiftool/tags/ifd"
"github.com/evanoberholster/exiftools/exiftool/tags/ifdexif"
)
// Errors for Parsing of Time
var (
ErrParseYear = fmt.Errorf("Error parsing Year")
ErrParseMonth = fmt.Errorf("Error parsing Month")
ErrParseDay = fmt.Errorf("Error parsing Day")
ErrParseHour = fmt.Errorf("Error parsing Hour")
ErrParseMin = fmt.Errorf("Error parsing Min")
)
// ModifyDate - the date and time at which the Exif file was modified
func (res ExifResults) ModifyDate() (time.Time, error) {
// "IFD" DateTime
if dateRaw, err := res.GetTag("IFD", 0, ifd.DateTime).GetString(res.exifReader); err == nil && dateRaw != "" {
// "IFD/Exif" SubSecTime
subSecRaw, _ := res.GetTag("IFD/Exif", 0, ifdexif.SubSecTime).GetString(res.exifReader)
if dateTime, err := parseExifFullTimestamp(dateRaw, subSecRaw); err == nil && !dateTime.IsZero() {
return dateTime, nil
}
}
return time.Time{}, ErrEmptyTag
}
// DateTime - the date and time at which the EXIF file was created
// with sub-second precision
func (res ExifResults) DateTime() (time.Time, error) {
// "IFD/Exif" DateTimeOriginal
if dateRaw, err := res.GetTag("IFD/Exif", 0, ifdexif.DateTimeOriginal).GetString(res.exifReader); err == nil && dateRaw != "" {
// "IFD/Exif" SubSecTimeOriginal
subSecRaw, _ := res.GetTag("IFD/Exif", 0, ifdexif.SubSecTimeOriginal).GetString(res.exifReader)
if dateTime, err := parseExifFullTimestamp(dateRaw, subSecRaw); err == nil && !dateTime.IsZero() {
return dateTime, nil
}
}
// "IFD/Exif" DateTimeDigitized
if dateRaw, err := res.GetTag("IFD/Exif", 0, ifdexif.DateTimeDigitized).GetString(res.exifReader); err == nil && dateRaw != "" {
// "IFD/Exif" SubSecTimeDigitized
subSecRaw, _ := res.GetTag("IFD/Exif", 0, ifdexif.SubSecTimeDigitized).GetString(res.exifReader)
if dateTime, err := parseExifFullTimestamp(dateRaw, subSecRaw); err == nil && !dateTime.IsZero() {
return dateTime, nil
}
}
return time.Time{}, ErrEmptyTag
}
// parseExifFullTimestamp parses dates like "2018:11:30 13:01:49" into a UTC
// `time.Time` struct.
func parseExifFullTimestamp(fullTimestampPhrase string, subSecString string) (timestamp time.Time, err error) {
defer func() {
if state := recover(); state != nil {
err = state.(error)
}
}()
parts := strings.Split(fullTimestampPhrase, " ")
datestampValue, timestampValue := parts[0], parts[1]
dateParts := strings.Split(datestampValue, ":")
year, err := strconv.ParseUint(dateParts[0], 10, 16)
if err != nil {
err = ErrParseYear
return
}
month, err := strconv.ParseUint(dateParts[1], 10, 8)
if err != nil {
err = ErrParseMonth
return
}
day, err := strconv.ParseUint(dateParts[2], 10, 8)
if err != nil {
err = ErrParseDay
return
}
timeParts := strings.Split(timestampValue, ":")
hour, err := strconv.ParseUint(timeParts[0], 10, 8)
if err != nil {
err = ErrParseHour
return
}
minute, err := strconv.ParseUint(timeParts[1], 10, 8)
if err != nil {
err = ErrParseMin
return
}
second, err := strconv.ParseUint(timeParts[2], 10, 8)
if err != nil {
err = ErrParseMin
return
}
subSec, err := strconv.ParseUint(subSecString, 10, 16)
if err != nil {
subSec = 0
}
timestamp = time.Date(int(year), time.Month(month), int(day), int(hour), int(minute), int(second), int(subSec*1000000), time.UTC)
return timestamp, nil
}
// ParseTimestamp parses dates like "2018:11:30" into a UTC `time.Time` struct.
func parseTimestamp(dateStamp string, hour, min, sec int) (timestamp time.Time, err error) {
defer func() {
if state := recover(); state != nil {
err = state.(error)
}
}()
dateParts := strings.Split(dateStamp, ":")
year, err := strconv.ParseUint(dateParts[0], 10, 16)
if err != nil {
err = ErrParseYear
return
}
month, err := strconv.ParseUint(dateParts[1], 10, 8)
if err != nil {
err = ErrParseMonth
return
}
day, err := strconv.ParseUint(dateParts[2], 10, 8)
if err != nil {
err = ErrParseDay
return
}
timestamp = time.Date(int(year), time.Month(month), int(day), hour, min, sec, 0, time.UTC)
return timestamp, nil
}