milliseconds

问题 I need to parse a datetime contains milliseconds for matching the max value in a field containing this datetimes. For example: #standardSQL SELECT PARSE_DATETIME('%Y-%m-%d %H:%M:%S.%u','2017-08-18 16:04:40.890') Any suggestions? Thanks in advance. UPDATE : Convert to milliseconds, suddendly MAX() . #standardSQL WITH Input AS ( SELECT date FROM UNNEST([ DATETIME '2017-08-18 16:04:40.890', DATETIME '2017-07-27 11:09:10.347', DATETIME '2017-08-22 13:17:34.727', DATETIME '2017-08-22 13:17:34.737'

问题 The thing is, I have to somehow get current time of day in milliseconds in convenient format. Example of desired output: 21 h 04 min 12 s 512 ms I know how to get this format in seconds, but I have no idea how to get my hands on milliseconds? 回答1: Using the portable std::chrono auto now = std::chrono::system_clock::now(); auto time = std::chrono::system_clock::to_time_t(now); auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(now.time_since_epoch()) - std::chrono::duration_cast

问题 In Java, we can have many different ways to get the current timestamp, but which one is recommended: Instant.now().toEpochMilli() or System.currentTimeMillis() 回答1: Both are fine. And neither is recommended except for a minority of purposes. What do you need milliseconds since the epoch for? In Java, we can have many different ways to get the current timestamp, For current timestamp just use Instant.now() . No need to convert to milliseconds. Many methods from the first years of Java, also

问题 Given the following issue with rounding milliseconds under R. How do I get around it so that the times are correct? > options(digits.secs=3) > as.POSIXlt("13:29:56.061", format='%H:%M:%OS', tz='UTC') [1] "2012-06-07 13:29:56.060 UTC" > as.POSIXlt("13:29:56.062", format='%H:%M:%OS', tz='UTC') [1] "2012-06-07 13:29:56.061 UTC" > as.POSIXlt("13:29:56.063", format='%H:%M:%OS', tz='UTC') [1] "2012-06-07 13:29:56.063 UTC" I noticed that this URL provides background information but doesn't solve my

问题 I'm making a program in which I need to get the time in milliseconds. By time, I mean a number that is never equal to itself, and is always 1000 numbers bigger than it was a second ago. I've tried converting DateTime.Now to a TimeSpan and getting the TotalMilliseconds from that... but I've heard it isn't perfectly accurate. Is there an easier way to do this? 回答1: Use the Stopwatch class. Provides a set of methods and properties that you can use to accurately measure elapsed time. There is

问题 I need to convert a Date to its corresponding Milliseconds format.I am using getTime() method of Date class in Java for this. But the milliseond generated is not of my actual date. It is one day less than my date. For eg, I have 22-Nov-2014 . If I convert this date to milliseconds format then 1,416,594,600,000 is generated. Actually this value corresponds to 21-Nov-2014 . Please help me to get an exact milliseconds value corresponds to a Date in java. 回答1: 1416594600000 corresponds to 2014-11

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 the following Timestamp vector: Timestamp <- c("30-09-2016 11:45:00.000", "01-10-2016 06:19:57.860", "01-10-2016 06:20:46.393") Timestamp is part of a table (unfortunately it doesn't seem to be a data.frame...) that contains other columns of degrees and weight: Timestamp Weight Degrees 1 30-09-2016 11:45:00.000 38.19 40.00 2 01-10-2016 06:19:57.860 39.12 40.00 3 01-10-2016 06:20:46.393 42.11 41.00 I would like to plot Weight against Timestamp, but the mode of Timestamp is "character",

问题 I want to use moment.js to shift an input moment to a different timezone and get its timestamp. moment.tz(moment(), "Pacific/Auckland").valueOf(); The problem is, while I am doing this, the moment.tz( ) object is looking good, but the valueOf() method is somehow calculating this back to timezone which is set on my computer. What is wrong with my approach? Thanks very much. EDIT 1 moment.tz(moment(), "Pacific/Auckland").format(); is giving me the right time string moment.tz(moment(), "Pacific

问题 Lets say i have long currentMillis and long oldMillis. The difference between the two timestamps is very tiny and always less than 1 second. If i want to know the difference between the timestamps in milleseconds, i can do the following: long difference = currentmillis-oldmillis; And if i want to convert difference to seconds, i can just divide it by 1000. However if the difference in milliseconds is less than 1000 milliseconds(<1 second), dividing it by 1000 will result in 0. How can i get