date

命令功能

查询及设置系统时间。

命令格式
  1. date
  3. date --help
  5. date +Format
  7. date -s YY/MM/DD
  9. date -s hh:mm:ss
  11. date -r Filename(暂不支持)
参数说明
参数参数说明取值范围
—help使用帮助
+Format根据Format格式打印时间—help中列出的占位符
-s YY/MM/DD设置系统时间，用“/”分割的年月日>= 1970/01/01
-s hh:mm:ss设置系统时间，用“:”分割的时分秒
-r查询文件修改时间（暂不支持）
使用指南
  • date参数缺省时，默认显示当前系统时间。
  • --help、+Format、-s、-r不能混合使用。
使用示例
  1. Huawei LiteOS # date
  2. Fri Jan  2 07:05:54 1970
  5. Huawei LiteOS # date --help
  7. Usage: date [+FORMAT]
  8.    or: date [-s] [YY/MM/DD] [hh:mm:ss]
  9. Display the current time in the given FORMAT, or set the system date.
  10. FORMAT controls the output.  Interpreted sequences are:
  11.   %b     The abbreviated month name according to the current locale.
  12.   %B     The full month name according to the current locale.
  13.   %C     The century number (year/100) as a 2-digit integer. (SU)
  14.   %d     The day of the month as a decimal number (range 01 to 31).
  15.   %e     Like %d, the day of the month as a decimal number, 
  16.          but a leading zero is replaced by a space.
  17.   %h     Equivalent to %b.  (SU)
  18.   %H     The hour as a decimal number using a 24-hour clock (range 00 to 23).
  19.   %I     The hour as a decimal number using a 12-hour clock (range 01 to 12).
  20.   %j     The day of the year as a decimal number (range 001 to 366).
  21.   %k     The hour (24-hour clock) as a decimal number (range  0  to  23); 
  22.          single digits are preceded by a blank.  (See also %H.)  (TZ)
  23.   %l     The hour (12-hour  clock) as a decimal number (range 1 to 12); 
  24.          single digits are preceded by a blank.  (See also %I.)  (TZ)
  25.   %m     The month as a decimal number (range 01 to 12).
  26.   %M     The minute as a decimal number (range 00 to 59).
  27.   %n     A newline character. (SU)
  28.   %p     Either "AM" or "PM" according to the given time value, 
  29.          or the corresponding strings for the current locale.
  30.          Noon is treated as "PM" and midnight as "AM".
  31.   %P     Like %p but in lowercase: "am" or "pm" 
  32.          or a corresponding string for the current locale. (GNU)
  33.   %s     The number of seconds since the Epoch, that is,
  34.          since 1970-01-01 00:00:00 UTC. (TZ)
  35.   %S     The second as a decimal number (range 00 to 60).
  36.          (The range is up to 60 to allow for occasional leap seconds.)
  37.   %t     A tab character. (SU)
  38.   %y     The year as a decimal number without a century (range 00 to 99).
  39.   %Y     The year as a decimal number including the century.
  40.   %%     A literal '%' character.
  42. Examples:
  43. Set system date (2017-01-01)
  44. $ date -s 2017/01/01
  45. Set system time (12:00:00)
  46. $ date -s 12:00:00
  47. Show the time with format Year-Month-Day
  48. $ date +%Y-%m-%d