New option -volume_date, for grub-mkrescue: -as mkisofs --modification-date=

xorriso/xorriso.1

@@ -9,7 +9,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH XORRISO 1 "Apr 06, 2010"
+.TH XORRISO 1 "Apr 07, 2010"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -1985,6 +1985,34 @@ System Area in image blocks 0 to 15.
 Permissible are up to 32 characters. This setting gets overridden by
 image loading.
 .TP
+\fB\-volume_date\fR type timestring
+Set one of the four overall timestamps for subsequent image writing.
+Available types are:
+.br
+"c"  time when the volume was created.
+.br
+"m"  time when volume was last modified.
+.br
+"x"  time when the information in the volume expires.
+.br
+"f"  time since when the volume is effectively valid.
+.br
+"uuid"  sets a timestring that overrides "m" time literally.
+.br
+It must consist of 16 decimal digits which form YYYYMMDDhhmmsscc, with
+YYYY between 1970 and 2999.
+It is supposed to match this GRUB line:
+.br
+ search --fs-uuid --set YYYY-MM-DD-hh-mm-ss-cc
+.br
+E.g. 2010040711405800 is 7 Apr 2010 11:40:58 (+0 centiseconds).
+.br
+Timestrings for the other types may be given as with option -alter_date.
+They are prone to timezone computations. The timestrings "default" or
+"overridden" cause default settings: "c" and "m" will show the current time
+of image creation. "x" and "f" will be marked as insignificant.
+"uuid" will be deactivated.
+.TP
 \fB\-out_charset\fR character_set_name
 Set the character set to which file names get converted when writing an
 image. See paragraph "Character sets" for more explanations.