suppose i have one column in mysql database which is stated last time one equipment is up in h:i:s format (ex: 00:05:11) or 1d21h, means that the equipment is on since 5 min before, what is the best method i can convert this to unix timestamp, say if using php script how? or direct convert last unix timestamp using mysql function query.
actually, i want to calculate for start time for this equipment uptime in unix timestamp where i have one column in mysql startcapture that will be deducted with last column to get start time. so starttime = startcapture - last (this last time that has to convert to unix timestamp based on now() - h:i:s ). but the problem is sometimes the format change from h:i:s to ex: 1d22h, if h:i:s means the equipment is up since ex: 00:05:11 min before and if 1d22h means the equipment already up 1 day 22 hours before.
so the main things here is to convert last column to appropriate unix timestamp.
please help guys, asap.
update:
simplified like this,
i want to display the start time, that can only be calculate by deducting startcapture column with last column,
startcapture column in unix timestamp, while the last column in h:i:s format sometimes in 1d22h format (means the equipment is already up since 1 day 22 hour or since 00:05:11, hours minute seconds)
the only things I want is to convert last column into unix timestamp which is time() - (00:05:11 or 1d22h),
is there any specific function?
If you have the time parsed into variables then you can use mktime to get the timestamp:
http://www.php.net/manual/en/function.mktime.php
Related
Ive recently purchases a script from a website and I was going through the code to see how it inserts and extracts data from mysql... there's this one cell in a table title "issue_date" has just numerical values in it and I am not familiar with this date format, the other column "expiry_date" is the same. Here are the values in the mysql cells "issue_date" [1565481600] and "expiry date" [1568073600]. on the frontend page these numbers translate in to today's (issue) date + 350 days (expiry) date. I need help with identifying the format these numbers are in. Thanks.
It is in timestamp format.
A timestamp is a numeric value in seconds between the current time and value as at 1st January, 1970 00:00:00 Greenwich Mean Time (GMT).
The value returned by the time function depends on the default time zone.
visit https://www.guru99.com/php-date-functions.html
Check time value of time in human readable form
The format is a Unix Time Stamp.
Here's a good website to convert given Unix Time stamp to human readable format, and back.
I am stuck for couple of Days on SQL specific scenario. The scenario is as follows,
I have a table, lets call it traffic which has 2 columns -> date and `vehicle (well many more but those are the two I need to match).
The date column is stored as Unix Timestamp. Now this would have been easy to just compare the current date (obtain from php from time() function) however the trick here is that some of these dates have time attached to them also.
For example if you run strtotime(13-02-2017 13:00) and strtotime(13-02-2017) you will get 2 different results. Basically I only care to match the date and not the time.
So I need some way to select the vehicle and date from the database that are equalled to the current Unix Timestamp but with the trick explained above, so I just need to much the date ONLY if possible.
You can use FROM_UNIXTIME() to convert a timestamp to a datetime, and then use the DATE() function to get the date part of that.
WHERE DATE(FROM_UNIXTIME(date)) = CURDATE()
However, this can't use an index, so another way that can make use of an index is to check if it's in a range of timestamps for the current date:
WHERE date BETWEEN UNIX_TIMESTAMP(CURDATE()) AND UNIX_TIMESTAMP(CURDATE()) + 86399
(there are 86400 seconds in a day).
SELECT * FROM traffic WHERE DATE(date) = DATE(CURRENT_TIMESTAMP);
What i want is simple, i have timestamp in my mysql database that records date and time data registers. What i want is to calculate the timediff between timestamp and current time then subtract from 3hours to know time remaining in hh:mm:ss format, please someone help out.
You should use the following part in your query:
SELECT TIME_FORMAT(SEC_TO_TIME(AVG(TIMESTAMPDIFF(SECOND, NOW(), column_with_date_to_compare))), '%H:%i')
You must skip the AVG part if you do not want averages but a result per row (or you have only one row to check) (or use GROUP BY [something])
The part 'then subtract from 3hours', I don't understand. You only want to show the records where the time is less than 3 hours? Just use WHERE TIME(record_to_check) > (NOW() - 10800).
If you want to add, calculate or do other things to influence the result, just do so before SEC_TO_TIME, you can do the math (with seconds) there.
I've interpretted your question as how to calculate the time remaining in a 3 hour period starting at a datetime stored in a DB, to be displayed in HH:MM:SS format...
I generally find it easier to manipulate dates / times in php rather than wihtin an SQL query. So my approach would be to:
read strings from the database
convert them into unix timestamps (ie
number of seconds elapsed since a given epoch)
manipulate them mathematically (ie add on 3 hours and subtract the curent time)
lastly convert the result back into a date / time in your chosen
format.
Assuming $start_str has been read from your DB
$start_str = '08-03-2017 11:10:00';
$start_ts = strtotime("$start_str");
$end_ts = $start_ts + (3 * 60 * 60);
$now_ts = strtotime('NOW');
$remaining_ts = $end_ts - $now_ts;
$remaining_str = ($remaining_ts > 0)? sprintf('%02d:%02d:%02d', ($remaining_ts/3600),($remaining_ts/60%60), $remaining_ts%60) : "None, time's up";
echo ($start_str.'|'.$start_ts.'|'.$end_ts.'|'.$now_ts.'|'.$remaining_ts.'|'.$remaining_str);
Examples...
08-03-2017 11:10:00|1488971400|1488982200|1488983863|-1663|None, time's up
08-03-2017 14:30:00|1488983400|1488994200|1488983982|10218|02:50:18
Obviously in reality you're only interested in the last field, but the others show you what you're playing with during the process.
Suppose I want to see the last 24 hours data from my database which is saved as a Unix Timestamp.
So, the process will be:
Get current time.
Get last 24 hours time.
Unix Timestamp ---
current time --- 1439212332
last 24 hours ---- 1439207714
I have tried in many different ways, but all my processes are wrong. Can someone tell me how to solve this problem ?
I am working on PHP and using a MySQL database.
Your query would look something like this:
SELECT * FROM table WHERE mycolumn < UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 1 DAY))
This takes the date of 'now', subtracts one day from it and then converts it to a Unix timestamp to use on whichever column you're storing the value in.
I want to ask about changing a datetime value of PHP with datetime value from MySQL data.
I have try to do this at PHP:
$sitgl = date('Y-m-d', strtotime(2012-01-12));
$sijam = date('H:i:s', strtotime(13:00:00));
$awal = $sitgl.' '.$sijam;
$awal2 = date('Y-m-d H:i:s', strtotime($awal));
$debrangkat = strtotime($awal2);
And I'm trying to convert same datetime at MySQL like this (convert it to seconds):
SELECT date_start_book, time_start_book, (TO_DAYS(CAST(date_start_book AS DATE))*86400) + TIME_TO_SEC(CAST(time_start_book AS TIME)) FROM `t_request_queue` WHERE `request_id` = '1301-0087'
which is date_start_book value is 2012-01-12 and time_start_book value is 13:00:00
My question is: why the PHP code return value : 1357970400 but the MySQL value return 63525214800 ?
what must I do to make both of value is same? Is strtotime() not return a seconds or why?
First of all as others have suggested that php code is really hurting brain. You could make that Unix Timestamp in just one line. But to answer your real question. MYSQL TO_DAYS works different than PHP UNIX Timestamp
According to MySQL Website
Given a date date, returns a day number (the number of days since year 0).
mysql> SELECT TO_DAYS(950501);
-> 728779
mysql> SELECT TO_DAYS('2007-10-07');
-> 733321
TO_DAYS() is not intended for use with values that precede the advent of the Gregorian calendar (1582), because it does not take into account the days that were lost when the calendar was changed. For dates before 1582 (and possibly a later year in other locales), results from this function are not reliable
And according to PHP Website timestamp is
Returns the current time measured in the number of seconds since the
Unix Epoch (January 1 1970 00:00:00 GMT).
And hence the difference in two values. Their starting point is way too distant from each other. MySQL starts from year 0 and PHP starts from year 1970.
Suggestion
I would suggest you save php's timestamp in mysql rather than a formatted date time. This will help you stay consistent and allow you to perform any date or time comparisons easily.
Finally, I change the PHP to datetime and at query I'm using ADD_DAYS to add a date with a seconds then I compare it with the PHP datetime result.
So many thanks to all contributor.