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This posting contains some information about the differences between DATE and TIMESTAMP and about format masks and how they work in Application Express. With apex, I pass a string like: 2017-02-05T01:44:00. Any help on this topic will be much appreciated.

The following example uses SYSTIMESTAMP. Also, take into account the timezone of the DateTime. You may need to change the format of the date string if you have a different locale.

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DATE, TIMESTAMP and format masks Publish date APEX version Database version Cloud or on Premise November 2017 all all both Developers are working with DATE or TIMESTAMP data types more or less all the time; they're being used in almost all APEX applications. This posting contains some information about the differences between DATE and TIMESTAMP and about format masks and how they work in Application Express. Internally, DATE stores year, month, day, hour, minute and second as explicit values. To get the current timestamp as an instance of DATE, use the SYSDATE SQL function. Internally, time zone information is also contained, but in order to work with time zones, one of the other two data types, TIMESTAMP WITH TIME ZONE or TIMESTAMP WITH LOCAL TIME ZONE must be used. To get the current timestamp as a TIMESTAMP instance, use the LOCALTIMESTAMP SQL function. As the DUMP result below shows, TIMESTAMP stores year, month, day, hour, minute and second similar to DATE. The other bytes are there for fractional seconds and time zone information. TIMESTAMP instances consume more space on disk than DATE instances, which is natural - they contain more information. A time zone can be used to create a TIMESTAMP WITH TIME ZONE instance and it is explicitly contained in the output use the right format mask. When the output of a TIMESTAMP WITH TIME ZONE value does not contain a time zone, you have incomplete data. Oracle does not implicitly convert instances of this data type between time zones; this can be done explicitly with the AT TIME ZONE clause. The following example uses SYSTIMESTAMP. FF6 TZR'; Session altered. Stored instances are normalized to the database time zone. When the data is retrieved, users see it again in the session time zone. The following example illustrates how TIMESTAMP WITH LOCAL TIME ZONE works: First, a table is created. Then the current time is retrieved and stored into the table SYSTIMESTAMP returns TIMESTAMP WITH TIME ZONE, but this is automatically converted to TIMESTAMP WITH LOCAL TIME ZONE. When the table is then being selected, the returned data changes with the session time zone. And now NLS format masks kick in - the format mask decides how a DATE is converted to a VARCHAR2 and back. The contains detailed imformation about format masks elements. Then the result is printed to the console - thus it must become a text again. It's important to be aware of these conversions when working with DATE or TIMESTAMP values and when printing results out. The following example shows, how DATE literals look like. However, a time component cannot be passed; and the time of the constructed DATE instance will always be midnight. When the session format mask does not contain a time component, that can lead to confusing behavior... Changing the date format masks clears everything up... So, when only the date portion is needed within the application, it's good practive to consistently set the time component to midnight. For the current day, this is easy by usin the TRUNC SQL function together with SYSDATE. The above paragraphs describe general database behavior - this is true for all applications working with the Oracle database. So, this all applies to Application Express as well. Application Express just contains some declarative settings in order to set the format masks and a bit of additional functionality. For every application, we can set the application default format masks. For this, navigate to Shared Components then to Application Definition Attributes and then to Globalization. If nothing is provided, the Oracle database defaults will apply. The Application Date Time Format is only used in specific APEX components like the Calendar. So, whenever DATE or TIMESTAMP without an explicit format mask is used in the APEX application, these attributes control their conversion to text and back. But APEX allows to set explicit format masks, for instancer in report columns or page items. These format masks supersede the default settings. There is one special format mask which is only available in Application Express: SINCE. It's being used within the application builder at several places. The SINCE format mask - in action SINCE formats the DATE or TIMESTAMP value as text - the text indicates how much time has passed since that very timestamp. The language is determined by the application language and messages are available for all languages which the Application Builder has been translated to. Of course, the translation must be installed as well. Within an APEX component, SINCE is simply being used as a format mask, as illustrated below. Use SINCE in your own APEX report DATE and TIMESTAMP instances are also important for APEX forms. And the same rules apply here as well, since APEX maintains all session state as VARCHAR2, independent from the page items' display type. That means, when the form is being loaded and the current row values are selected, APEX converts DATE or TIMESTAMP values to VARCHAR2 - according to the rules described above. If the developer provided an explicit format mask with the page item, it will be used. If not, the above mentioned application default format masks will be used - and if we don't even have these, database defaults apply. An example: We have a form item of the date picker type. It's based on a DATE column in a table. We have provided an explicit format mask: DD. The javascript code renders the date picker dialogs. YYYY' expression in provide an instance of DATE for the table column. Again: All Application Express items are maintained as VARCHAR2 - we only have String variables in Application Express. Whenever a DATE or TIMESTAMP value is selected from a table, inserted into a table or a table is updated, conversions between VARCHAR2 and DATE or TIMESTAMP happen. For these conversions, format masks are important. The same rules apply. YYYY' ; : -- processing here end; This concludes the article about DATE and TIMESTAMP data types and format masks. Of course, there is much more to say about working with DATE and TIMESTAMP in Application Express: Interval types, calculations with DATE and TIMESTAMP, converting between DATE and TIMESTAMP, and so on. These topics will be covered in a future blog posting - until then: have fun while working with Application Express.

Anon are several options though. These topics will be covered in a future blog posting - until then: have fun while working with Application Express. For these conversions, format masks are important. TIMESTAMP instances consume more space on disk than DATE instances, which is natural - they con more information. It's based on a DATE column in a table. When I create just a date instead of datetime, I lose the time and it sets it to 00:00:00. Then the current time is retrieved and stored into the table SYSTIMESTAMP returns TIMESTAMP WITH TIME ZONE, but this is anon converted to TIMESTAMP WITH LOCAL TIME ZONE. If not, the above mentioned application default format masks will be used - and if we don't even have these, database defaults apply.