Problem description
The value specified for the SignDate field of the x-oss-credential header in the PostObject request is invalid.
Causes
You initiated a PostObject request that includes a V4 signature, but the value specified for the SignDate field of the x-oss-credential header is invalid.
Examples
The format of the value of SignDate field of the x-oss-credential header is invalid, or the difference between the value of the SignDate field and the local time is large.
Solutions
Make sure that the value of the SignDate field of the x-oss-credential header is valid and is in the %Y%m%d format.
For more information, see PostObject.