Convert date/time to Unix epoch

I have thousands of date time stamps I would like to convert to Unix epoch ten-digit strings. That is, take some thing like:
Dec 9, 2005 10:24 AM
and convert to
1234567890 (only in the correct unix epoch time)
What formula can I use? I've found that this "=DATE(1970,1,1)+P2/86400" can convert a 10 string epoch time down to just a date correctly, but without time. But I need to go in the opposite direction, with the time included.
Using Numbers 09 ver 2.0.5 (368)

CP,
An up-to-date Unix Time would be provided by:
=DUR2SECONDS((NOW()-"1/1/1970"))
A somewhat more robust form would be:
=DUR2SECONDS(NOW()-DATE(1970,1,1))
If the time to be converted is in Cell P2, the expression would be:
=DUR2SECONDS(P2-DATE(1970,1,1))
Jerry

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How to return start and end time in Unix epoch format

Hi: I have a integer field (utime) in a table that stores the UNIX epoch time for a record. Every sunday around 2:00AM, I am running a query which should return records from last week. I want my condition to have the following in it's where
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(convert sysdate-7 12:00AM to Unix time)
AND
(convert yesterday 11:59PM to Unix time)
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Yes, you seem to have worked out the logic of the expression correctly. Though, in your earlier post you had said that you want records within the range:
WHERE utime between
(convert sysdate-7 12:00AM to Unix time)
AND
(convert yesterday 11:59PM to Unix time)But now you are adding 14400 (4hrs) and deducting 72000 (20hrs) in your expression
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((TRUNC(SYSDATE-6,'DD')-TO_DATE('01/01/1970','MM/DD/YYYY'))*(24*60*60))-72000;Which makes your new condition to be:
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(convert sysdate 04:00AM to Unix time)
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Are you sure you need records from 4am-to-4am and not midnight-to-midnight? And yes, with BETWEEN condition you need to use expression '<low-value> AND <high-value>' and not '<high-value> AND <low-value>'!
Besides this,
1. You might want to use bind variables rather than hard-coded expressions in your statement. Infact your expression uses SYSDATE, so Oracle would need to get current SYSDATE for each row to evaluate the expression. Which is going to have its impact on performance. As your start-time and end-time values are not dependent on table data maybe you could have a code like this (assuming it is PLSQL code):
start_time constant number := (convert sysdate-7 12:00AM to Unix time);
end_time constant number := (convert yesterday 11:59PM to Unix time);
<DML or Cursor with condition>
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2. You said that your table already has values in unix-epoch-time in column 'utime'. How are these values inserted in the first place? Is there a function in your application that converts any given time to unix-epoch-time? Is yes, then use that in your code.
3. If such a function does not exists, than rather than using hard-coded expressions it might be a good idea to create new functions for converting to and from unix-epoch-time and to get current unix-epoch-time from server.
Using a function in the above case:
start_time constant number := f_convert_to_unix_time( trunc( sysdate-7 ));
end_time constant number := f_convert_to_unix_time( trunc( sysdate )) - 1;
<DML or Cursor with condition>
WHERE utime between start_time and end_time;
And lastly, some of us might not know about Unix time, so here is a useful link http://en.wikipedia.org/wiki/Unix_time

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You can do this way..
Bind the date field to your XML tag.
Set the display pattern for the date field.
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Set JavaScript as language.
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FUNCTION MODULE TO CONVERT DATE / TIME INTO WORDS.

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Update date/time in UNIX timestamp format

The datetime in my Oracle DB is being stored in UNIX Date Time format.
Is there a way I can set the date/time using an UPDATE statement in such a case.
for eg:
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I am looking to update the value in the field. The values will still be in UNIX date/time format.Yes, but still: instead of continuing converting to Oracle dates and Unix dates, why not just store dates the way the datebase can deal with it the best?
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That is a great loss of lots of built-in date functionality Oracle Database provides.
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That is overkill.
It won't work/scale/perform/whatever in the end. It is a bad approach.
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If you have an java.util.Date object you can call getTime() method on it. It will return milliseconds. Just divide it on 1000. Here is example code:
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Urgent! Help wanted!
I extract a date-time field (which is GMT time) from the central database but I need to convert it accordding to the TimeZone of the user and also the so-called winter time and summer time in the local. Any one has any good solution?
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Use a Calendar, Timezone and Locale objects like this,
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These objects provide tonnes of features for finding out timezones and day light savings times. So check out the APIs as well.
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Convert Data time stamp to Local Time

Hello,
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Time from UNIX epoch

I have the number of micro seconds from the UNIX epoch time 00:00:00 UTC 1
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I need to get GMT time...
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Funny thing, look at the compareTo result....

Convert date/time to HEX command and write to a bin file

Hello,
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Thanks for the replies in advance
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Message Edited by igurov on 08-12-2009 01:51 AM
Attachments:
1(2).JPG ‏39 KB

Do you know the difference between decimal and hex values? It's not the same, that the whole point, and it's why it doesn't make sense. Decimal 32 is not the same as hex 32. These are two different values, even though they both have the digits "3" and "2". The hex value will be the same as the decimal value up to the value of 9. In your example the hour is 8. In decimal this is 8, in hex this is 8. The minutes is 45. That's decimal. In hex, this is 2D, not 45, as you claim in your example. Hex 45 is a completely different number (and a completely different "pattern").
Attachments:
time hex.vi ‏12 KB

Convert Date Time field to Date & Time

Post Author: Smita
CA Forum: Crystal Reports
I am new to Crystal XI . I need to convert DateTime ("2007/04/04/04 09:49:05:00") format to Date and Time and then group a months data first by date and then by Time ( per Hour ).
If someone can help ?
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Post Author: newcruser
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Thanks
This is easy...second group based on the second formula 'for each hour'.
How you group by 15 minutes?.
i want to group by every 15 minutes starting from 9 AM to 5 PM.
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Manjit wrote:
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Convert date/time to GMT format

Hi,
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tx in advance

i found the answer to my earlier question from the postings. Now i need help with the format og the Date in GMT.
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Calendar here = Calendar.getInstance();
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Convert date time to file date time

Hi,
I have standard delphi function which conver datetime to filedatetime here is the description
function DateTimeToFileDate(DateTime: TDateTime): Integer;
Description
Use DateTimeToFileDate to convert a TDateTime value, which is the representation of date-and-time values used by the VCL, to a DOS date-and-time value.
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Lo returns the low-order Byte of the argument X as an unsigned value. X is an expression of type Integer.
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year=2003
month=5
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min=45
hr=13
msec=107
LongRec(Result).Lo := (Sec shr 1) or (Min shl 5) or (Hour shl 11);
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Convert date/time to Unix epoch

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