avformat/utils: add a function to standardize creation time
This can be used for formats which write all format metadata as string to files, therefore non-standard creation times such as 'now' will be parsed. The standardized creation time is UTC ISO 8601 with microsecond precision. Reviewed-by: Nwm4 <nfxjfg@googlemail.com> Signed-off-by: NMarton Balint <cus@passwd.hu>
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