timestamp

问题 Jackson operates java.time.Instant with WRITE_DATE_TIMESTAMPS_AS_NANOSECONDS ( READ_ as well) enabled by default. jackson-datatype-jsr310 It produces JSON like this { "createDate":1421261297.356000000, "modifyDate":1421261297.356000000 } In JavaScript it's much easier to get Date from traditional millis timestamp (not from seconds/nanos as above), like new Date(1421261297356) . I think there should be some reason to have the nanos approach by default, so what is that reason? 回答1: One way is

问题 I have stored all the date into my database as varchar(10) , now I want to converse them into TIMESTAMP. When I run sql ALTER TABLE `demo3` CHANGE `date` `date` TIMESTAMP NOT NULL it alert: #1292 - Incorrect datetime value: '1320534000' for column 'date' at row 1 BTW, All my date formart are 10 digital number. 回答1: You should first change the timestamp to datetime and then can change the type of column. ALTER TABLE `demo3` MODIFY COLUMN `date` varchar(25); UPDATE `demo3` SET `date`= FROM

问题 I have stored all the date into my database as varchar(10) , now I want to converse them into TIMESTAMP. When I run sql ALTER TABLE `demo3` CHANGE `date` `date` TIMESTAMP NOT NULL it alert: #1292 - Incorrect datetime value: '1320534000' for column 'date' at row 1 BTW, All my date formart are 10 digital number. 回答1: You should first change the timestamp to datetime and then can change the type of column. ALTER TABLE `demo3` MODIFY COLUMN `date` varchar(25); UPDATE `demo3` SET `date`= FROM

问题 I am trying to find a way to programmatically check, under Linux and using C, if software transmit timestamps ( SOF_TIMESTAMPING_TX_SOFTWARE ) are supported by a given NIC, in order to revert to other kinds of timestamps (or disable them completely) if they are not supported. In particular, my goal would be to check if they are supported like it can be done for hardware timestamps, when calling ioctl(SIOCSHWTSTAMP) and checking its return value (the updated documentation can be found here).

问题 I'm editing a piece of code which basically does: timestamp = new Date(); And then persist that timestamp variable in a TIMESTAMP MySQL table column. However, while via debug I see the Date object displayed in the correct time-zone, GMT+1 , when persisted on database it is a GMT time-zone, so an hour back. Using the function CURRENT_TIMESTAMP returns a GMT+1 date. The connection string is jdbc:mysql://..../db-name , without any parameter. EDIT : Found this piece of code preparedStatement

问题 I have a database with 13000 rows. Each row contains the column 'date' which is now in this format (example): 2012-09-01 17:53:28 , but I want them to be a TIMESTAMP. What query should I run to update all columns named 'date' from date to timestamp on all rows? Thanks 回答1: It's pretty straightforward to convert from one type to another using the ALTER TABLE command: ALTER TABLE table_name CHANGE old_date new_timestamp TIMESTAMP This process may take a while to complete if you have a lot of

问题 I've got a table that refuses to use index, and it always uses filesort. The table is: CREATE TABLE `article` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `Category_ID` int(11) DEFAULT NULL, `Subcategory` int(11) DEFAULT NULL, `CTimestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, `Publish` tinyint(4) DEFAULT NULL, `Administrator_ID` int(11) DEFAULT NULL, `Position` tinyint(4) DEFAULT '0', PRIMARY KEY (`ID`), KEY `Subcategory` (`Subcategory`,`Position`,`CTimestamp`,`Publish`), KEY `Category_ID

问题 I'm trying to subtract two dates and expecting some floating values return. But what I got in return is as below: +000000000 00:00:07.225000 Multiplying the value by 86400 (I want to get the difference in second) is getting something even more strange value being returned: +000000007 05:24:00.000000000 any idea? I'm suspecting is has something to do with type casting. 回答1: I guess your columns are defined as timestamp rather than date . The result of subtracting timestamps is an interval

问题 Why 7/18/2013 11:33 is different in GMT timezone and in my local Time Zone (Asia/kolkata)? As Unix time-stamp are the ticks being calculated since epoch time 1/1/1970 00:00:00 GMT so i know that there the epoch time had occurred at different interval in different timezone but still. the number of second elapsed should have been same For example if I(+5:30 GMT) and My friend(+5:00 GMT) starts counting the ticks from 00:00 Hrs respectively so at 18:00 Hrs in both timezone number of ticks should

问题 So I have this stamp timestamp DEFAULT NOW() ON UPDATE NOW() row on my table, and I need it to update even when the update I'm executing is basically same data on all fields. Is there any way of doing this within the declaration of the table, like some other option other than on update , or do I have to force a stamp = now() every time I update (and remove the on update of course since it will be useless). I've seen this thread, but it only answers what is happening and why, not how to get