On 4/26/2017 4:27 AM, mfojtak wrote:
---
 libavformat/dashenc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
index 6232c70..fe1d6c2 100644
--- a/libavformat/dashenc.c
+++ b/libavformat/dashenc.c
@@ -433,7 +433,7 @@ static void format_date_now(char *buf, int size)
     struct tm *ptm, tmbuf;
     ptm = gmtime_r(&t, &tmbuf);
     if (ptm) {
-        if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%S", ptm))
+        if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%SZ", ptm))
             buf[0] = '\0';
     }
 }


This change appears to be correct. I wasn't previously knowledgeable about the 'Z' suffix, but I looked into it and it is documented in ISO 8601 (https://en.wikipedia.org/wiki/ISO_8601 and also http://www.ecma-international.org/ecma-262/5.1/#sec-15.9.1.15 ).

On a separate note, the actual format is: YYYY-MM-DDTHH:mm:ss.sssZ . The ".sss" part is missing from this implementation, which represents milliseconds. According to the specification, ".sss" may be absent, but maybe it would work with even more players if it were included. Technically, the specification states that an absent time-zone offset should be treated as 'Z', which indicates that the code was already compliant without the 'Z', even if it didn't work with most players. strftime() doesn't handle milliseconds, but perhaps it ought to populate milliseconds anyway as follows:

        if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%S.000Z", ptm))

Aaron Levinson
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