timestamp

问题 I would like to know if this is possible using a mysql query: I have a table called updates. In the updates table I have 2 columns, id and timestamp . I have 5 rows each with the same id but with different date timestamps. An example of this timestamp would be the value: 2012-08-04 23:14:09 . I would like to select only the most recent timestamp value out of the 5 results. This could also be explained by saying that I would like to select the value that is closest to the current date and time

问题 I need a single timestamp of milliseconds (ms) since epoch. This should not be hard, I am sure I am just missing some method of datetime or something similar. Actually microsecond (µs) granularity is fine too. I just need sub 1/10th second timing. Example. I have an event that happens every 750 ms, lets say it checks to see if a light is on or off. I need to record each check and result and review it later so my log needs to look like this: ...00250 Light is on ...01000 Light is off ...01750

问题 I want to name new files created by my Java application with the current timestamp. I need help with this. How do I name the new files created with the current timestamp? Which classes should I include? 回答1: No need to get too complicated, try this one liner: String fileName = new SimpleDateFormat("yyyyMMddHHmm'.txt'").format(new Date()); 回答2: try this one String fileSuffix = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()); 回答3: You can get the current timestamp appended with a file

问题 I have a string '20141014123456789' which represents a timestamp with milliseconds that I need to convert to a timestamp in Hive (0.13.0) without losing the milliseconds. I tried this but unix_timestamp returns an integer, so I lose the milliseconds: from_unixtime(unix_timestamp('20141014123456789', 'yyyyMMddHHmmssSSS')) >> 2014-10-14 12:34:56 Casting a string works: cast('2014-10-14 12:34:56.789' as timestamp) >> 2014-10-14 12:34:56.789 but my string isn't in that form. I think I need to

问题 I am creating some tables where I want to store the time when a record was created and when it was last updated. I thought I could have two timestamp fields where one would have the value CURRENT_TIMESTAMP and the other would have CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP . But I guess I can't do this because you can have only 1 timestamp field with a default value in a table? How would you recommend I get and store the two times? Thanks! 回答1: You can have two columns of type timestamp in

问题 I want to make a rebase to remove a certain commit from my history. I know how to do that. However if I do it, the commit timestamp is set to the moment I completed the rebase. I want the commits to keep the timestamp. I saw the last answer here: https://stackoverflow.com/a/19522951/3995351 , however it didn't work. The last important command just showed a new line with > So I am opening a new question. 回答1: The setup Let's say this is the history around the commit you want to remove ... o -

问题 I need to get a date in a specific format but can't work out how to do it. Here is how I'm getting the date at the moment. date -r "$timestamp" +'%Y-%m-%dT%H:%M:%S.s' However the issue is the milliseconds has too many digits for the format I need. I need the milliseconds to be limited to 3 digits. Any idea how I can do such a thing? Current Workaround Not accurate but it works. I calculate the milliseconds afterwards and then just take the first three characters of the string. Obviously this

问题 Elasticsearch experts, I have been unable to find a simple way to just tell ElasticSearch to insert the _timestamp field for all the documents that are added in all the indices (and all document types). I see an example for specific types: http://www.elasticsearch.org/guide/reference/mapping/timestamp-field/ and also see an example for all indices for a specific type (using _all): http://www.elasticsearch.org/guide/reference/api/admin-indices-put-mapping/ but I am unable to find any

问题 Following javascript code gives me output like : 1314066350368 new Date().getTime(); I would like to generate similar timestamp in PHP in order to get server's timestamp. kindly suggest me how to do it in PHP so my PHP code will generate exactly similar timestamps. P.S. I do know about time() and microtime() functions in PHP. But i am looking forward to get similar outputs as i have mentioned above. 回答1: Try this: <?php echo microtime(true)*1000; ?> 回答2: Did you try int time ( void ), Returns

问题 Following javascript code gives me output like : 1314066350368 new Date().getTime(); I would like to generate similar timestamp in PHP in order to get server's timestamp. kindly suggest me how to do it in PHP so my PHP code will generate exactly similar timestamps. P.S. I do know about time() and microtime() functions in PHP. But i am looking forward to get similar outputs as i have mentioned above. 回答1: Try this: <?php echo microtime(true)*1000; ?> 回答2: Did you try int time ( void ), Returns