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%Om month in alternative numeric representation
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%OM minutes in alternative numeric representation
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%OS seconds in alternative numeric representation
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%Ou weekday in the alternative format (Monday = 1)
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%OU week of the year in alternative numeric representation
(same as for %U)
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%OV week of the year in alternative numeric representation
(same as for %V)
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%Ow weekday in the alternative format (Sunday = 0)
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%OW week of the year in alternative numeric representation
(same as for %W)
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%Oy year in the alternative format
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Format 2: Set system clock
date[ -a[ -] ssss.fff][ -u][ new_date]
This format is for the system administrator only.
This format can be used to adjust the system clock or reset the date.
-a[ -] ssss.fff
Adjusts the system clock time by ssss.fff seconds, where fff
represents fractions of a second. This adjustment can be positive
or negative (-). The system's clock will be sped up or slowed
down until it has changed by the specified amount (ssss may not
exceed 2146).
-u Sets the date and time in Greenwich Mean Time (see option -u
under Format 1).
new_date
date sets the date and time of the system clock to the specified
value. The following can be entered for [mmdd]HHMM or
mmddHHMM[cc]yy:
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mm dd HH MM cc yy
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month day hour minute century year (last
(01 - 12) (01 - 31) (00 - 23) (00 - 59) minus 1 2 digits)
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mmdd not specified:
date assumes that the specified time HHMM refers to the current
date.
cc not specified:
date assumes that the specified date mmddHHMMyy refers to the
current century.
The system clock should only be set in single-user mode when all file
systems have been unmounted. Changing the system clock may otherwise
lead to inconsistencies in the file systems.
ERROR MESSAGES
Format 2
date: no permission.
You have tried to set the system clock as a normal user. This
privilege is reserved for the system administrator.
date: bad conversion.
You have attempted to set the system clock but have called date with
an incorrect format.
ENVIRONMENT VARIABLES
TZ If defined, the environment variable TZ contains information on
timezones. date uses TZ to determine the timezone and to convert
from UTC (Universal Time Coordinated) to local time and vice
versa.
The value of TZ consists of
- the standard timezone
- the offset from UTC in hours
- if relevant, the summer timezone with information for conver-
sions from standard time to summer time (daylight saving time)
and back.
A detailed description of TZ is provided under sh(1) in the sec-
tion "Standard shell variables".
LOCALE
The LC_MESSAGES environment variable governs the language in which
message texts are displayed.
The LC_TIME environment variable governs the language and the format
in which the date and time and the values of date and time constants
are displayed.
LC_CTYPE governs character classes and character conversion (shift-
ing).
If LC_MESSAGES, LC_TIME or LC_CTYPE is undefined or is defined as the
null string, it defaults to the value of LANG. If LANG is likewise
undefined or null, the system acts as if it were not international-
ized.
If any of the locale variables has an invalid value, the system acts
as if none of the variables were set.
The LC_ALL environment variable governs the entire locale. LC_ALL
takes precedence over all the other environment variables which affect
internationalization.
EXAMPLES
Example 1: Printing date and time (Format 1)
If you call date without arguments at 17:00 hours EST on July 15,
1991, and the system clock is set to the correct time, the following
will be printed:
Mon Jul 15 17:00:00 EST 1991
The command:
$ date '+DATE: %m/%d/%y%nTIME: %H:%M:%S'
generates the following output:
DATE: 07/15/91
TIME: 17:00:00 If you now call date without arguments at 17:05 hours
EST on July 15, 1991, and the system clock is set to the correct time,
the following will be printed:
15 July 91
Example 2: Setting the system clock (Format 2)
You are working under the system administrator login root and want to
set the date and time to 16:30 on March 17, 1991. To do this, you must
first switch to single-user mode and unmount all file systems. You
then enter:
# date 0317163091
If you are calling date in the year 1991, there is no need to specify
the year.
SEE ALSO
cal(1), sysadm(1M), ctime(3C), printf(3S), strftime(4), environ(5).