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e9a910b33c
i currently use the output of sha512sum in several places of xbmk, which is a bit unreliable in case output changes. other cases where i use util outputs in variables are probably reliable, because i'm using mostly posix utilities in those. to mitigate this, i now import suckless sbase, which has a reasonable sha512sum implementation. *every* binary it builds is being placed in build.list, because i'll probably start using more of them. for example, i may start modifying the "date" implementation, adding the GNU-specific options that i need as mentioned on init.sh i'm importing it in util/ because the sha512sum util is needed for verifying project sources, so if sbase itself is a "project source", that means we can into a chicken and egg bootstrapping problem. this is sbase at revision: 055cc1ae1b3a13c3d8f25af0a4a3316590efcd48 Signed-off-by: Leah Rowe <leah@libreboot.org>
82 lines
1.5 KiB
Groff
82 lines
1.5 KiB
Groff
.Dd October 8, 2015
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.Dt DATE 1
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.Os sbase
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.Sh NAME
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.Nm date
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.Nd print or set date and time
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.Sh SYNOPSIS
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.Nm
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.Op Fl d Ar time
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.Op Fl u
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.Oo
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.Cm + Ns Ar format |
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.Sm off
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.Ar mmddHHMM Oo Oo Ar CC Oc Ar yy Oc
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.Sm on
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.Oc
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.Sh DESCRIPTION
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.Nm
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prints the date and time according to
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.Xr locale 7
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or
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.Ar format
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using
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.Xr strftime 3
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or sets the date.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl d Ar time
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Print
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.Ar time
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given as the number of seconds since the
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Unix epoch 1970-01-01T00:00:00Z.
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.It Fl u
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Print or set UTC time instead of local time.
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.El
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.Pp
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An operand with a leading plus
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.Pq Cm +
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sign signals a user-defined format string using
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.Xr strftime 3
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conversion specifications.
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.Pp
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An operand without a leading plus sign is interpreted as a value
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for setting the system's current date and time.
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The canonical representation for setting the date and time is:
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.Pp
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.Bl -tag -width Ds -compact -offset indent
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.It Ar mm
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The month of the year, from 01 to 12.
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.It Ar dd
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The day of the month, from 01 to 31.
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.It Ar HH
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The hour of the day, from 00 to 23.
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.It Ar MM
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The minute of the hour, from 00 to 59.
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.It Ar CC
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The first two digits of the year (the century).
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.It Ar yy
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The second two digits of the year.
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If
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.Ar yy
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is specified, but
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.Ar CC
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is not, a value for
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.Ar yy
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between 69 and 99 results in a
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.Ar CC
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value of 19.
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Otherwise, a
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.Ar CC
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value of 20 is used.
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.El
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.Pp
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The century and year are optional.
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The default is the current year.
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.Sh STANDARDS
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POSIX.1-2013.
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.Pp
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The
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.Op Fl d
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flag is an extension to that specification.
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