V3/usr/man/man2/mdate.2

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NAME		mdate  --  set modified date on file
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SYNOPSIS	(time to r0-r1)
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sys mdate; file  / mdate = 30.
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DESCRIPTION	File____
is the address of a null-terminated string giving the
name of a file.
The modified time of the file is set to the time given in
the r0-r1 registers.
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This call is allowed only to the super-user
or to the owner of the file.
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SEE ALSO	--
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DIAGNOSTICS	Error bit
is set if the user is neither the owner nor the super-user or if the file cannot be found.
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BUGS		--