Datetime difference (elapsed time)

Serverless Stack

Use either two numeric datetimes or two complex datetimes to calculate the difference (elapsed time) between two different datetimes. Use subtraction to calculate the difference between two numeric datetimes of the same time unit such as milliseconds. For complex datetimes there is often a method or another complex type (object) available to calculate the difference. Use ChronoUnit to calculate the difference between two complex datetimes if supported.

• Calculate the difference in milliseconds between two numeric datetimes:

  long startTimestamp = 434931327000L;
  long endTimestamp = 434931330000L;
  long differenceInMillis = endTimestamp - startTimestamp;
  		

• Calculate the difference in milliseconds between two complex datetimes:

  ZonedDateTime zdt1 =
          ZonedDateTime.of(1983, 10, 13, 22, 15, 30, 11000000, ZoneId.of('Z'));
  ZonedDateTime zdt2 =
          ZonedDateTime.of(1983, 10, 13, 22, 15, 35, 0, ZoneId.of('Z'));
  long differenceInMillis = ChronoUnit.MILLIS.between(zdt1, zdt2);
  		

• Calculate the difference in days between two complex datetimes:

  ZonedDateTime zdt1 =
          ZonedDateTime.of(1983, 10, 13, 22, 15, 30, 11000000, ZoneId.of('Z'));
  ZonedDateTime zdt2 =
          ZonedDateTime.of(1983, 10, 17, 22, 15, 35, 0, ZoneId.of('Z'));
  long differenceInDays = ChronoUnit.DAYS.between(zdt1, zdt2);