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MySQL updating strings in a column to be DateTime

I am saving a date formatted with Javas SimpleDateFormat with the format "E. MMM-dd-YYYY hh:mm a zzz" eg "Sat. Apr-15-2017 10:44 PM EST" to a table as a VARCHAR.
How would I go about changing all of the pre-existing data to be in DateTime format?

Have you tried this?
UPDATE `table`
SET `column` = STR_TO_DATE(`column`,'%Y-%m-%d')
refer to change mysql comumn from varchar to datetime and convert data post

insert java date time into Oracle

Oracle date format on server is MM/DD/YYYY HH24:Mi:SS
I would like to insert a variable which contains a date with timestamp into Oracle date column.
I am getting error while inserting date into Oracle "date column ends before format picture ends".
All I want is append specific timestamp to java string date and insert that string/date format into Oracle database
example:
String incoming_date = request.getParameter("insert_date"); //this comes as a string in dd-mon-yyyy format
formatted_incoming_date = incoming_date + " 00:00:01"; //I want to append time factor to above variable with 00:00:01
insert into testtable values(formatted_incoming_date);

Try this
insert into testtable values(TO_DATE (formatted_incoming_date, 'dd-mon-yyyy hh24:mi:ss);

Why you try to insert date as a string? It seems like there is an implicit conversion from string to date in Oracle. Can java.sql.Date be used instead?
Anyway, as long as date comes in format dd-mon-yyyy you have to convert it either into java.sql.Date object or in proper for Oracle string representation as MM/DD/YYYY HH24:Mi:SS i.e.
incoming date "05-12-2016" string for Oracle "12/05/2016 00:00:00"

How to select by date only if field is a timestamp?

I have a database field timestamp without timezone, that has values like 2015-11-23 14:42:55.278.
Now I want to find database records with just using the date part 2015-11-13.
Is that possible?
Ideally using hibernate and spring.

I'm not sure if is the best way in performace terms, but you may search dates between 2015-11-23 00:00:00.000 and 2015-11-23 23:59:59.999

If you want to fetch only for day 2015-11-13 then you can fetch all records using between keyword and by using timestamp of start of day.
dateField between 2015-11-13:<time_of_beginning_of_day> AND 2015-11-14:<time_of_beginning_of_next_day>
or
dateField between 2015-11-13:<time_of_beginning_of_day> AND 2015-11-13:<time_of_end_of_day>

You can cast the column to a date, e.g:
Postgres specific:
the_timestamp_column::date = date '2015-11-13'
or (standard SQL)
cast(the_timestamp_column as date) = date '2015-11-13'
You can also "reduce" the timestamp to different levels using date_trunc()
http://www.postgresql.org/docs/current/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC

How to format date in flex?

I'm using Flex+java+Mysql.. in that i want to insert the datetime taking from flex to mysql in that i got date String like this
Sat Aug 4 12:05:00 GMT+0530 2012
how to convert yyyy-MM-dd HH:mm:ss z
this formate so please give code in java or flex...

In flex API Given DateFile class, in that we have two methods dateTOString(), stringTODate().
DateField.dateToString(dateInput.selectedDate,"DD-MM-YYYY");
Please Refere Below Doc.
DateField

DateField.dateToString(addr1.selectedDate,"YYYY-MM-DD").toString();

Wrong date to string conversion

I am using TO_CHAR(last_used) to retrieve the date in String format from Oracle Database 11g. The output I get when I run the query: SELECT last_used, TO_CHAR(last_user, 'yyyy-MM-dd hh:mm:ss') as dtime1 FROM mytable WHERE id='120000'; is:
LAST_USED
---------------------------------------------------------------------------
DTIME1
-------------------
17-MAY-12 11.53.28.000000 PM -07:00
2012-05-17 11:05:28
Could any one let me know why this is happening?

MM is the format for month. Use MI for the minutes.