lavf/flvdec: normalize exporting date metadata

Export them in UTC, not the local timezone. This way the output is
the same everywhere. The timezone information stored in the file is
still ignored, since there seems to be no simple way to export it
correctly.

Format them according to ISO 8601, which we generally use for exporting
dates.

Fixes fate-flv-demux, which was broken since
958bea5248f87116b0dd080461aa70c14ea86cf0 on some platforms.

1 files changed, 5 insertions, 2 deletions

diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index e6c2877a74..ddaceaafe4 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -686,8 +686,11 @@ static int amf_parse_object(AVFormatContext *s, AVStream *astream,
             struct tm t;
             char datestr[128];
             time =  date.milliseconds / 1000; // to seconds
-            localtime_r(&time, &t);
-            strftime(datestr, sizeof(datestr), "%a, %d %b %Y %H:%M:%S %z", &t);
+            gmtime_r(&time, &t);
+
+            // timezone is ignored, since there is no easy way to offset the UTC
+            // timestamp into the specified timezone
+            strftime(datestr, sizeof(datestr), "%Y-%m-%dT%H:%M:%SZ", &t);
 
             av_dict_set(&s->metadata, key, datestr, 0);
         }