Tadalafil 10mg pills $195.00 In my previous article Oracle, tadalafil 10mg pills $195.00 SQL, tadalafil 10mg pills $195.00 Dates and Timestamps I talked about inserting, tadalafil 10mg pills $195.00 selecting and comparing dates in Oracle. Tadalafil 10mg pills $195.00 Now I want to cover some functionality for converting between time zones.

Tadalafil 10mg pills $195.00 We’ll use the table in the form specified in the previous article, tadalafil 10mg pills $195.00 but insert one more row:

Tadalafil 10mg pills $195.00 insert into dates values(6, tadalafil 10mg pills $195.00 to_date('09/20/05 23:15', tadalafil 10mg pills $195.00 'MM/DD/YY HH24:MI'));

Tadalafil 10mg pills $195.00 The contents of the table now look like this:

Tadalafil 10mg pills $195.00 1 09/14/05, tadalafil 10mg pills $195.00 21:08
2 09/27/05, tadalafil 10mg pills $195.00 00:00
3 10/02/05, tadalafil 10mg pills $195.00 22:05
4 09/01/05, tadalafil 10mg pills $195.00 17:01
5 09/12/05, tadalafil 10mg pills $195.00 14:30
6 09/20/05, tadalafil 10mg pills $195.00 23:15

Tadalafil 10mg pills $195.00 Changing Time Zones

Tadalafil 10mg pills $195.00 The date format in Oracle does not contain time zone information, tadalafil 10mg pills $195.00 but the database does. Tadalafil 10mg pills $195.00 To find out the time zone set, tadalafil 10mg pills $195.00 execute this query:

Tadalafil 10mg pills $195.00 SELECT dbtimezone FROM dual;

Tadalafil 10mg pills $195.00 DBTIME
------
-04:00

Tadalafil 10mg pills $195.00 The time zone can be updated with the command:

Tadalafil 10mg pills $195.00 ALTER database SET TIME_ZONE = '-05:00';

Tadalafil 10mg pills $195.00 where you can specify the offset from Greenwich mean time or a valid time zone from the list in the v$timezone_names view. Tadalafil 10mg pills $195.00 Note that this is one of the few of the ‘v$’ views which are plural.

Tadalafil 10mg pills $195.00 Switching Time Zones

Tadalafil 10mg pills $195.00 The function new_time is used to convert a time to different time zones. Tadalafil 10mg pills $195.00 To illustrate this we’ll look at entry 5 from the dates file.

Tadalafil 10mg pills $195.00 SELECT entry, tadalafil 10mg pills $195.00 to_char(entry_date, tadalafil 10mg pills $195.00 'MM/DD/YY HH:MI AM') FROM dates WHERE entry=5;

Tadalafil 10mg pills $195.00 5 09/12/05 02:30 PM

Tadalafil 10mg pills $195.00 This database is in US Eastern time but we want to display the time in US Central.

Tadalafil 10mg pills $195.00 SELECT entry, tadalafil 10mg pills $195.00 to_char(new_time(entry_date, tadalafil 10mg pills $195.00 'EST', tadalafil 10mg pills $195.00 'CST'), tadalafil 10mg pills $195.00 'MM/DD/YY HH:MI AM') FROM dates WHERE entry=5;

Tadalafil 10mg pills $195.00 5 09/12/05 01:30 PM

Tadalafil 10mg pills $195.00 Here we clearly see the time converted to Central. Tadalafil 10mg pills $195.00 Note that the new_time function is performed on the date field, tadalafil 10mg pills $195.00 not on the to_char. Tadalafil 10mg pills $195.00 Now let’s grab this time in Pacific time:

Tadalafil 10mg pills $195.00 SELECT entry, tadalafil 10mg pills $195.00 to_char(new_time(entry_date, tadalafil 10mg pills $195.00 'EST', tadalafil 10mg pills $195.00 'PST'), tadalafil 10mg pills $195.00 'MM/DD/YY HH:MI AM') FROM dates WHERE entry=5;

Tadalafil 10mg pills $195.00 5 09/12/05 11:30 AM

Tadalafil 10mg pills $195.00 Now we see not only the time converted, tadalafil 10mg pills $195.00 but also the time of day has gone from PM to AM.

Tadalafil 10mg pills $195.00 Now let’s take a look at entry 6:

Tadalafil 10mg pills $195.00 SELECT entry, tadalafil 10mg pills $195.00 to_char(entry_date, tadalafil 10mg pills $195.00 'MM/DD/YY HH:MI AM') FROM dates WHERE entry=6;

Tadalafil 10mg pills $195.00 6 09/20/05 11:15 PM

Tadalafil 10mg pills $195.00 We’ll again assume this timestamp is in US Eastern time, tadalafil 10mg pills $195.00 but let’s convert it this time to Greenwich Mean Time.

Tadalafil 10mg pills $195.00 SELECT entry, tadalafil 10mg pills $195.00 to_char(new_time(entry_date, tadalafil 10mg pills $195.00 'EST', tadalafil 10mg pills $195.00 'GMT'), tadalafil 10mg pills $195.00 'MM/DD/YY HH:MI AM') FROM dates WHERE entry=6;

Tadalafil 10mg pills $195.00 6 09/21/05 04:15 AM

Tadalafil 10mg pills $195.00 This shows not only the change in hours, tadalafil 10mg pills $195.00 but that the date of this entry is displayed properly for its time zone.

Tadalafil 10mg pills $195.00 Of course the new_time function can be used on inserts in the same way. Tadalafil 10mg pills $195.00 This is useful if you are allowing input from people in different geographical regions. Tadalafil 10mg pills $195.00 Here we convert an entry made in Pacific Time to Eastern:

Tadalafil 10mg pills $195.00 INSERT INTO dates
VALUES (7, tadalafil 10mg pills $195.00
new_time(to_date('09/22/05 10:28 AM', tadalafil 10mg pills $195.00 'MM/DD/YY HH:MI AM'), tadalafil 10mg pills $195.00 'PST', tadalafil 10mg pills $195.00 'EST'));

Tadalafil 10mg pills $195.00 SELECT entry, tadalafil 10mg pills $195.00 to_char(entry_date, tadalafil 10mg pills $195.00 'MM/DD/YY HH:MI AM') FROM dates WHERE entry=7;

Tadalafil 10mg pills $195.00 7 09/22/05 01:28 PM

Tadalafil 10mg pills $195.00 So we have converted 10:28 AM Pacific to 1:28 PM Eastern so all our entries in the table are consistent. Tadalafil 10mg pills $195.00 Of course when performing the insert we need to put the to_date function within the new_time function so the text string is converted to a date format before we try to convert it.

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