mysql - Regarding the issue of time storage, do you guys use the local time or UTC time when you save the database time?

For example, when it comes to time storage, do you store the time in the database in local time or in UTC world time?

伊谢尔伦 2017-06-15 09:21:15 0  4  1284

javascript - js How to calculate the number of days, hours, minutes and seconds between two timestamps

How to calculate the number of days, hours, minutes and seconds between two timestamps in js

仅有的幸福 2017-05-19 10:12:14 0  3  1317

Field traversal, why do the two time fields of the database not appear?

Field traversal, why do the two time fields of the database not appear?

外星人 2018-12-17 23:28:50 0  2  1193

How does the WeChat applet submit the obtained timestamp to the database?

I have obtained the timestamp, but now I cannot display it directly on the page? My plan is to put it in the form. After the user fills out the form and submits it, the form information and submission time will be automatically saved in the database.

A 未来动力人工智能 2020-01-30 22:53:25 0  3  1916

Please help. With the new version of phpstudy, why will the database disappear after a while?

I would like to ask, if you use the new version of phpstudy, what happens if the database disappears after a while?

风月幻想 2018-09-26 00:42:45 0  2  1385

Create database tables and manage activity over time

There are two types of users, one is free users and the other is paid users. As a user with FreeUser role, I can only have 3 open (time has not ended yet) activities because PayingUser has no limit. How to manage it in database table

P粉054616867 2023-09-14 09:27:53 0  1  586

javascript - Time dimension of recursive functions in native JS

1. Question: Today I occasionally saw a "new word" about the time dimension of native js recursive functions. Please help all the experts and seniors to clarify...

phpcn_u1582 2017-06-12 09:24:23 0  1  627

React-chartjs-2: Keep y-axis scaling static when zooming

Is there a way to disable the automatic scaling of the y-axis when I scale a time series chart? You can observe the behavior here: https://codesandbox.io/s/react-chartjs-2-line-zoom-pan-9cz0eh When you zoom, the y-axis will scale so that the data takes up all the y-axis space. My zoom plugin looks l...

P粉621033928 2024-01-28 23:46:48 0  1  508

javascript - About highchart data rendering

Image description The chart above adds data dynamically. The variable xdata in the code is a time, and the format is 17:21:11. It can be printed out, and the y-axis can also be printed normally. But now the Y-axis data can be rendered normally, but the x-axis cannot be displayed. The expected effect...

習慣沉默 2017-06-26 10:53:06 0  1  868

Database access time

Mine is always 1:00 seconds, but the teacher's is only 0.05s. Is it because of a configuration problem?

乘风破浪 2019-01-16 14:03:25 0  2  1054

javascript - When registering, the same user registers multiple times, and multiple pieces of the same data appear in the database. The background has been verified, and the front-end js also limits submission once every two seconds, but multiple pieces of data still appear.

When registering, the same user registers multiple times, and multiple pieces of the same data appear in the database. The background has been verified, and the front-end js also limits submission once every two seconds, but multiple pieces of data still appear.

世界只因有你 2017-06-30 09:52:16 0  8  965

Java - Can milliseconds be removed from the displayed time?

The time in the database is the acquisition time of DateTime type {code...} Can it be removed? It’s so ugly.

仅有的幸福 2017-06-23 09:14:23 0  2  964

python - Problems with matplotlib's x-axis display

I recently learned pandas and data visualization and made a practice program {code...}. The problem is that when I do this, I can’t see the time on the X-axis. How to solve it?

代言 2017-07-05 10:27:12 0  1  926

java - springboot returns wrong time

Configure the time zone according to what is said on the Internet. I have tried both upper and lower case. The time printed in the second picture is consistent with the database and is correct. However, after executing the return, the time becomes eight hours and the database It shows nine o'clock, ...

给我你的怀抱 2017-05-17 10:05:06 0  1  803

java - mysql automatically deletes data every other day

How does mysql automatically delete data after the specified time? I am using Java to make a to-do list and using mysql as a database. I want to automatically delete the completed rows the next day. Compare the timestamp I set with the current time and then delete them. Because I am using se, it is ...

过去多啦不再A梦 2017-06-16 09:19:28 0  7  1154

Scatterplot points do not maintain values ​​when zooming in d3.js

This is my first time using d3.js, so please bear with me. I implemented it as pure JavaScript in vue.js file. I'm trying to make a scatter plot with zoom functionality. So far I have almost everything working fine, but when I zoom I notice that the x-axis is not scaling correctly, but the y-axis is...

P粉294954447 2024-04-06 18:16:26 0  1  695

How can I use javascript to record how long the user stays on the page?

I want to write a js that counts how long users stay on the page. There are currently two methods, but neither of them is ideal. Timer, use ajax to send data to the database at certain intervals. This method cannot guarantee accuracy and will affect efficiency. Use the onunload event to send data wh...

给我你的怀抱 2017-05-19 10:40:39 0  1  521

How to check if a time period overlaps with another time period in PHP Laravel

How to check if the working time of a specific user for a given time period already exists in the database. Therefore, the function should return true when working hours overlap with the given date and time. I tried it but it doesn't work. functioncheckExistingWorkingHours($user_id,$start_date,$star...

P粉011360903 2023-09-03 00:18:11 0  2  649

How do everyone write PHP programs to process the HTML code entered by the user?

In order to filter HTML and JS code, should htmlspecialchars() be called before writing the library or when reading the library? Or what?

PHPz 2017-05-27 17:43:23 0  2  933

In a multi-user environment, how does tp5 verify whether the data has been modified by others before it is submitted and saved? Is there any built-in verification method?

In a multi-user environment, multiple users view and modify the same piece of data. How to verify that the data has not been modified by other users before the user submits and saves it? I want to add a timestamp field to the database table design to save the data modification time. time, and then p...

phpcn_u16587 2018-01-05 02:05:53 0  1  1114