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.Dd 2015-10-08
.Dt DATE 1
.Os sbase
.Sh NAME
.Nm date
.Nd print or set date and time
.Sh SYNOPSIS
.Nm
.Op Fl d Ar time
.Op Fl u
.Oo
.Cm + Ns Ar format |
.Sm off
.Ar mmddHHMM Oo Oo Ar CC Oc Ar yy Oc
.Sm on
.Oc
.Sh DESCRIPTION
.Nm
prints the date and time according to
.Xr locale 7
or
.Ar format
using
.Xr strftime 3
or sets the date.
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl d Ar time
Print
.Ar time
given as the number of seconds since the
Unix epoch 1970-01-01T00:00:00Z.
.It Fl u
Print or set UTC time instead of local time.
.El
.Pp
An operand with a leading plus
.Pq Cm +
sign signals a user-defined format string using
.Xr strftime 3
conversion specifications.
.Pp
An operand without a leading plus sign is interpreted as a value
for setting the system's current date and time.
The canonical representation for setting the date and time is:
.Pp
.Bl -tag -width Ds -compact -offset indent
.It Ar mm
The month of the year, from 01 to 12.
.It Ar dd
The day of the month, from 01 to 31.
.It Ar HH
The hour of the day, from 00 to 23.
.It Ar MM
The minute of the hour, from 00 to 59.
.It Ar CC
The first two digits of the year (the century).
.It Ar yy
The second two digits of the year.
If
.Ar yy
is specified, but
.Ar CC
is not, a value for
.Ar yy
between 69 and 99 results in a
.Ar CC
value of 19.
Otherwise, a
.Ar CC
value of 20 is used.
.El
.Pp
The century and year are optional.
The default is the current year.
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2013
specification.
.Pp
The
.Op Fl d
flag is an extension to that specification.