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Time zone resolution and how to adjust the time zone in Linux preface today we found that the system time of Centos6.0-64bit in Vmware is several hours different from that of the host machine. after adjusting the system time, restart and restore the

Time zone resolution and how to adjust the time zone in Linux preface today we found that the Centos 6.0-64bit system time in Vmware differs from the host time for several hours, after adjusting the system time, restart and restore the system. So I

Http://www.linuxidc.com/Linux/2010-09/28537.htmThe exchange of date and timestamp under Linux1. Date to timestamp:$ Date-d ' 2009-12-01 23:20 ' +%s 12596808002. Timestamp to date$ Date-d ' 1970-01-01 1259680800 sec UTC ' Tue Dec 1 23:20:00 CST 20093.

Rm/etc/localtimeLn-sf/usr/share/zoneinfo/america/anguilla/etc/localtimeTo re-establish a soft connection for the localtime configuration problemImmediate effect[[Email protected] ~]# DateFri SEP 4 04:58:20 AST 2015Set the system time:Date-s

Nowadays, more and more work needs to use the time zone concepts around the world. Recently, I have seen abbreviations such as DST, EDT, PDT, wet, and CCT in my documents, which makes me dizzy. So I made a memo on the Internet: The time zone

Internal storage format: century, year, month, day, hour, minute, second The default format is: DD-MON-RR. Sysdate returns the current system time. SELECT sysdate from DUAL; The mathematical operation of a date SELECT (sysdate-hire_date)/7 from

Date functionDate functions manipulate Date values (fields of date type), timestamp values (TIMESTAMP, TIMESTAMP with time ZONE, and TIMESTAMP with the fields of the local time ZONE type), and interval values (INTERVAL day to SECOND and INTERVAL

---------------------------------------------Date/Time function-------------------------------------------------1:   Sysdate is used to get the current date of the system select Sysdate from Dual;--2:  add_months Add or Subtract month select To_char

Oracle databases perform detailed operations on date data. The expression of date data involves the system time zone and time format. Oracle system functions such as to_date ('string', 'format') and to_char (Date, 'format') are often used. Therefore,

Mathematical functions 1. Absolute Value S: Select ABS (-1) Value O: Select ABS (-1) value from dual 2. INTEGER (large) S: Select ceiling (-1.001) Value O: Select Ceil (-1.001) value from dual 3. Round (small) S: Select floor (-1.001) Value O: