milliseconds

问题 Here is my code. int hours = (int) (timeElapsed / 3600000); int minutes = (int) (timeElapsed - hours * 3600000) / 60000; int seconds = (int) (timeElapsed - hours * 3600000 - minutes * 60000) / 1000; I need to now calculate MilliSeconds that runs really fast. Please help me how? 回答1: One way to speed up things is to minimize the run-time mathematical operations by reusing some of the intermediate calculations. Adding some constants, whose calculation is done at compile-time, will increase

问题 I am trying to get the date and time (last modified) of some files from a folder. I managed to get the date and hour/minutes/seconds but I can not get the milliseconds . I already tried formatting the column in all the ways possible. I only get 0 for milliseconds. My code so far does: the user chooses a folder the code displays in column A all the file names found and in column B the date, hour,minute and seconds (last modified date/time) What should I do to the current code to obtain the

问题 I'm trying to work with a calendar in android, and when I try to convert a date into milliseconds, I get different results on different runs. When I print out the values of milliseconds1 and milliseconds2, I get different results different times! My code is as follows: Calendar calendar1 = Calendar.getInstance(); Calendar calendar2 = new GregorianCalendar(TimeZone.getTimeZone("GMT")); calendar1.set(1997, 9, 3); calendar2.set(1997, 9, 01); long milliseconds1 = calendar1.getTimeInMillis(); long

问题 i want to figure out the time from the beginning of the day given a days milliseconds. so say i'm given this: 1340323100024 which is like mid day of 6/21/2012. now i want the milliseconds from the beginning of the day, which would be 1340262000000 (at least i think that's what it's supposed to be.) how do i get 1340262000000 from 1340323100024? i tried doing Math.floor(1340323100024/86400000) * 86400000 but that gives me 1340236800000, which if i create a date object out of it, says its the

问题 I am having trouble converting posix_time::ptime to a timestamp represented by time_t or posix_time::milliseconds , or any other appropriate type which can be easily printed (from Epoch). I actually need just to print the timestamp represented by the posix_time::ptime in milliseconds, so if there is an easy way to print in that format, I don't actually need the conversion. 回答1: This code will print the number of milliseconds since 1941-12-07T00:00:00. Obviously, you can choose whatever epoch

问题 in my app I'm updating some stuff if the time is between certain hours of the day which the user choose. It works fine if the user chooses something like "07-21", but not with "21-07" which is over the night. How I'm doing to check the time is I'm getting the current hour and converting it into milliseconds. Then I check if the current milli is between the chosen hours (those are also converted into milliseconds). Like this: if (currentMilli >= startHourMilli && currentMilli <= endHourMilli)

问题 in my app I'm updating some stuff if the time is between certain hours of the day which the user choose. It works fine if the user chooses something like "07-21", but not with "21-07" which is over the night. How I'm doing to check the time is I'm getting the current hour and converting it into milliseconds. Then I check if the current milli is between the chosen hours (those are also converted into milliseconds). Like this: if (currentMilli >= startHourMilli && currentMilli <= endHourMilli)

问题 I'm trying to store in timestamp with timezone field my value. It is in milliseconds from 1970. select TO_CHAR(TO_TIMESTAMP(1401432881230), 'DD/MM/YYYY HH24:MI:SS.MS') Expected 30/5/2014 11:29:42 10:54:41.230 , but get 22/08/46379 23:27:02.000 回答1: Unix timestamps measures time with seconds, and not milliseconds ( almost everywhere, in PostgreSQL too). Therefore you need to call SELECT TO_TIMESTAMP(1401432881230 / 1000); If you want to preserve milliseconds, call with double precision :

问题 I'm trying to store in timestamp with timezone field my value. It is in milliseconds from 1970. select TO_CHAR(TO_TIMESTAMP(1401432881230), 'DD/MM/YYYY HH24:MI:SS.MS') Expected 30/5/2014 11:29:42 10:54:41.230 , but get 22/08/46379 23:27:02.000 回答1: Unix timestamps measures time with seconds, and not milliseconds ( almost everywhere, in PostgreSQL too). Therefore you need to call SELECT TO_TIMESTAMP(1401432881230 / 1000); If you want to preserve milliseconds, call with double precision :

问题 Soundcloud's API gives the duration of it's tracks as milliseconds. JSON looks like this: "duration": 298999 I've tried many functions I found on here to no avail. I'm just looking for something to convert that number to something like looks like this: 4:59 Here's one that got close, but doesn't work. It doesn't stop the seconds at 60. It goes all the way to 99 which makes no sense. Try entering "187810" as a value of ms, for example. var ms = 298999, min = Math.floor((ms/1000/60) << 0), sec