timestamp

问题 I have date_created and date_modified columns on each table in database. What are advantages/disadvantages setting timestamp columns at database using MySQL triggers vs setting them at application layer using PHP? Which is easier to maintain and have better time synchronization when deployed across on many servers? EDIT: since Johan suggested setting timestamps in database is good, are these correct implementations? additionally, is it good practice to have date_created and date_modified on

问题 Regarding Timestamps and code signing with signtool - is it considered a best practice to apply stamps from multiple timestamp authorities to signed code? Further related questions that may help me to understand: Is it possible to apply multiple timestamps utilizing different timestamp servers? If my understanding is correct from this article the answer is yes See: Alternative timestamping services for Authenticode If so, do the multiple timestamps provide validation "fail-over" of the

问题 I am trying to do a timestamp difference in Spark and it is not working as expected. Below is how I'm trying to import org.apache.spark.sql.functions.* df = df.withColumn("TimeStampDiff", from_unixtime(unix_timestamp(df.col("TimeStampHigh"), "HH:mm:ss").minus(unix_timestamp(df.col("TimeStampLow"), "HH:mm:ss")),"HH:mm:ss")) Values TimeStampHigh - 15:57:01 TimeStampLow - 00:11:57 It returns me a result of 10:45:04 Expected output - 15:45:04 My other alternative is to go to an UDF with Java

问题 I want to convert my input into a timestamp value. I have only found a dateconverter in examples. Are there any best practises? Thank you Update: I want to save a birthday of a user but my backend requires a timestamp value. And I have problems with binding it to my jsf frontend.. Maybe a link to an example would be helful :-) I tried it as follows: public void setBday(Date bday) { member.setBirthday(new Timestamp(bday.getTime())); } public Timestamp getBday() { return member.getBirthday(); }

问题 I am inserting into the table with field type "timestamp with time zone" string "1858-11-17 01:09:05+0000" and getting back strage formated value "05:11:29+04:02:24". Here is session test=> create table ddtbl (val timestamp with time zone); CREATE TABLE test=> insert into ddtbl (val) values ('1858-11-17 01:09:05+0000'); INSERT 0 1 test=> select * from ddtbl; val ------------------------------ 1858-11-17 05:11:29+04:02:24 Why is this happening and what is "+04:02:24" here ? UPD: PostgreSQL

问题 I'm using a local sqlite database to do offline processing of metadata in my application and the metadata includes timestamps. I have a table declared as follows: CREATE TABLE if not exists tbl_dbsync_meta ( maindb_last_checked TIMESTAMP, global_scores_last_checked TIMESTAMP, localscores_syncup_last_checked TIMESTAMP) Now, at one point I retrieve the CURRENT_TIMESTAMP from sqlite along with all the other timestamps above, so as to - naturally - figure out the differences in time between now

问题 A quick question to Bigquery gurus. Here are two methods for extracting date from a timestamp in Bigquery using standardSQL #standardSQL #1 DATE(TIMESTAMP_MILLIS(CAST((timestamp) AS INT64))) #2 EXTRACT(DATE FROM TIMESTAMP_MILLIS(timestamp)) Which one is more preferable and why? Thanks! 回答1: It really comes down to personal preference; one isn't superior to the other since they have the same semantics and performance. The argument in favor of using EXTRACT is that if you are extracting other

问题 I have a Unix timestamp that I need to get the individual year, month, day, hour, minute and second values from. I never was very good in math class so I was wondering if you guys could help me out a little :) I have to do everything myself (no time.h functions). The language is C. 回答1: Disclaimer: The following code does not account for leap years or leap seconds [Unix time does not account for leap seconds. They're overrated, anyway. -Ed] . Also, I did not test it, so there may be bugs. It

问题 I created DB from google chrome's Cookies file and one of the columns in the cookies table is expires_utc . The format of the column is like - 13169399213145330, which is more like unix time. But when i'm trying to use unix time converter, it gives wrong values. So, what format is that and how i can convert it to actually unix time? 回答1: So, after long researches on this topic, here is the solution: Chrome's cookies timestap's epoch starts 1601-01-01T00:00:00Z (Why? Because.) So, it's

问题 In Perl I am trying to read a log file and will print only the lines that have a timestamp between two specific times. The time format is hh:mm:ss and this is always the third value on each log. For example, I would be searching for lines that would fall between 12:52:33 to 12:59:33 I am new to Perl and have no idea which route to take to even begin to program this. I am pretty sure this would use some type of regex, but for the life of me I cannot even begin to fathom what that would be.