时间管理

    • %a 星期名的缩写（Sun）
    • %A 星期名的全称（Sunday）
    • %b 月份的缩写（Jan）
    • %B 月份的全称（January）
    • %c 日期和时间（Thu Mar 3 23:05:25 2005）
    • %C 世纪，就是年份数省略后两位（20）
    • %d 一个月的第几天（01）
    • %D 日期，等同于%m/%d/%y
    • %e 一个月的第几天，用空格补零，等同于
    • %F 完整的日期，等同于%Y-%m-%d
    • %g last two digits of year of ISO week number (see %G)
    • %h 等同于
    • %H 小时（00..23）
    • %I 小时（01..12）
    • %j day of year (001..366)
    • %k hour ( 0..23)
    • %l hour ( 1..12)
    • %m month (01..12)
    • %M minute (00..59)
    • %N nanoseconds (000000000..999999999)
    • %p locale’s equivalent of either AM or PM; blank if not known
    • %P like %p, but lower case
    • %r locale’s 12-hour clock time (e.g., 11:11:04 PM)
    • %R 24-hour hour and minute; same as %H:%M
    • %S second (00..60)
    • %T time; same as %H:%M:%S
    • %u day of week (1..7); 1 is Monday
    • %U week number of year, with Sunday as first day of week (00..53)
    • %V ISO week number, with Monday as first day of week (01..53)
    • %w day of week (0..6); 0 is Sunday
    • %W week number of year, with Monday as first day of week (00..53)
    • %x locale’s date representation (e.g., 12/31/99)
    • %X locale’s time representation (e.g., 23:13:48)
    • %y last two digits of year (00..99)
    • %Y year
    • %z +hhmm numeric timezone (e.g., -0400)
    • %:z +hh:mm numeric timezone (e.g., -04:00)
    • %Z alphabetic time zone abbreviation (e.g., EDT)

    cal 命令