int WallStHoursFromLocal(int *wall_st_hours_from_gmt_out) {
Time now = Now();
int local_hours_from_gmt = RFC822TimeZone(LocalTimeZone(now));
int wall_st_hours_from_gmt = RFC822TimeZone(WallStTimeZone(now));
if (wall_st_hours_from_gmt_out) *wall_st_hours_from_gmt_out = wall_st_hours_from_gmt;
return -1 * local_hours_from_gmt + wall_st_hours_from_gmt;
}
dng_string dng_date_time_info::Encode_ISO_8601 () const
{
dng_string result;
if (IsValid ())
{
char s [256];
sprintf (s,
"%04u-%02u-%02u",
(unsigned) fDateTime.fYear,
(unsigned) fDateTime.fMonth,
(unsigned) fDateTime.fDay);
result.Set (s);
if (!fDateOnly)
{
sprintf (s,
"T%02u:%02u:%02u",
(unsigned) fDateTime.fHour,
(unsigned) fDateTime.fMinute,
(unsigned) fDateTime.fSecond);
result.Append (s);
if (fSubseconds.NotEmpty ())
{
bool subsecondsValid = true;
uint32 len = fSubseconds.Length ();
for (uint32 index = 0; index < len; index++)
{
if (fSubseconds.Get () [index] < '0' ||
fSubseconds.Get () [index] > '9')
{
subsecondsValid = false;
break;
}
}
if (subsecondsValid)
{
result.Append (".");
result.Append (fSubseconds.Get ());
}
}
// Kludge: Early versions of the XMP toolkit assume Zulu time
// if the time zone is missing. It is safer for fill in the
// local time zone.
dng_time_zone tempZone = fTimeZone;
if (tempZone.NotValid ())
{
tempZone = LocalTimeZone (fDateTime);
}
result.Append (tempZone.Encode_ISO_8601 ().Get ());
}
}
return result;
}