mtime=

        # Zlib::GzipWriter.mtime=

(from ruby core)
### Implementation from GzipWriter
---
    mtime=(p1)

---

Specify the modification time (`mtime`) in the gzip header. Using an
Integer.

Setting the mtime in the gzip header does not effect the mtime of the
file generated. Different utilities that expand the gzipped files may
use the mtime header. For example the gunzip utility can use the `-N`
flag which will set the resultant file's mtime to the value in the
header. By default many tools will set the mtime of the expanded file to
the mtime of the gzipped file, not the mtime in the header.

If you do not set an mtime, the default value will be the time when
compression started. Setting a value of 0 indicates no time stamp is
available.