java - How to get the time of the day in milliseconds? -


i want time of day in milliseconds, not day have specific date, time. made something, thought worked, went debugging , concluded doesn't work how want to.

i want use check if current time between both specified starttime , endtime.

    long starttime = settings.getlong("starttime", 0);     long endtime = settings.getlong("endtime", 0);      if ((currenttime.getmillis() >= starttime)             && (currenttime.getmillis() <= endtime)) {             //do stuff here   }

how setting time of propeties starttime , endtime:

                        calendar starttime = calendar.getinstance();                         starttime.set(calendar.hour_of_day, 16);                         starttime.set(calendar.minute, 00);                         editor.putlong("starttime",                                 starttime.gettimeinmillis());                          calendar endtime = calendar.getinstance();                         endtime.set(calendar.hour_of_day, 16);                         endtime.set(calendar.minute, 00);                         endtime.add(calendar.hour_of_day, 11);                         editor.putlong("endtime",                                 endtime.gettimeinmillis());                         editor.commit();

however mean both starttimeand endtime have specific date attached it.

i hope explained well, appreciated!

avoid milliseconds

no need mess milliseconds purpose. using milliseconds date-time confusing , error-prone.

what need decent date-time library rather notoriously troublesome bundled java.util.date & .calendar classes.

joda-time

if want ignore dates , ignore time zones, here's example code using localtime class offered third-party free-of-cost joda-time library.

localtime start = new localtime( 10, 0, 0 ); localtime stop = new localtime( 14, 30, 0 ); localtime target = localtime.now(); boolean isnowinspan = !( ( target.isbefore( target ) ) | ( target.isafter( stop ) ) );

adjust last line according business logic needs. might want:

  • the beginning , ending inclusive
  • the beginning , ending exclusive
  • "half-open" beginning inclusive , ending exclusive
    (usually best date-time work)

dump console…

system.out.println( "start: " + start ); system.out.println( "stop: " + stop ); system.out.println( "target: " + target ); system.out.println( "isnowinspan: " + isnowinspan );

when run…

start: 10:00:00.000 stop: 14:30:00.000 target: 23:49:37.779 isnowinspan: false

another example

time-of-day-only not right way go. when new date-time work, naïve programmer may @ first think time-only simplifies things. on contrary, example shows how spinning around clock creates complications. using date+time+timezone best approach in long run.

localtime = localtime.now(); localtime start = new localtime( 13, 0, 0, 0 ); localtime stop = start.plushours( 11 );  system.out.println( "now: " + ); system.out.println( "start: " + start ); system.out.println( "stop: " + stop );  if ( now.isafter( start ) ) {     system.out.println( "after start" ); }  if ( now.isbefore( stop ) ) {     system.out.println( "before stop" ); }

when run…

now: 14:00:32.496 start: 13:00:00.000 stop: 00:00:00.000 after start

java.time

java 8 brings new java.time package, inspired joda-time, defined jsr 310.

in java.time, find localtime class similar 1 in joda-time.


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