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sâmbătă, 21 noiembrie 2015

[OmniFaces utilities 2.0] Returns the amount of hours/minutes/seconds between two given dates


[OmniFaces utilities] The hoursBetween() function returns the amount of hours between two given dates. The minutesBetween() function returns the amount of minutes between two given dates. The secondsBetween() function returns the amount of seconds between two given dates.

Functions:
Usage:

Helper bean to define two dates:

@Named
@RequestScoped
public class DateBean {

 private Date firstDate;
 private Date secondDate;

 // not thread-safe
 SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");

 String firstDateInString = " 8:10:11";
 String secondDateInString = " 12:15:43";

 public DateBean() {
  try {
      firstDate = formatter.parse(firstDateInString);
      secondDate = formatter.parse(secondDateInString);
  } catch (ParseException ex) {
      //...
  }
 }

 public Date getFirstDate() {
  return firstDate;
 }

 public Date getSecondDate() {
  return secondDate;
 }
}

This event will last from #{dateBean.firstDate} to #{dateBean.secondDate}:

#{of:hoursBetween(dateBean.firstDate, dateBean.secondDate)} hours!
#{of:minutesBetween(dateBean.firstDate, dateBean.secondDate)} minutes!
#{of:secondsBetween(dateBean.firstDate, dateBean.secondDate)} seconds!

Output:

This event will last from Thu Jan 01 08:10:11 EET 1970 to Thu Jan 01 12:15:43 EET 1970:
4 hours!
245 minutes!
14732 seconds!

You can use this information for creating different kinds of loops. Per example:

Display time hour by hour using ui:repeat:
<ui:repeat value="#{of:createArray(of:hoursBetween(dateBean.firstDate, dateBean.secondDate))}" varStatus="i">
 Hour: #{(dateBean.firstDate.hours + i.index) += ':' += dateBean.firstDate.minutes += ':' += dateBean.firstDate.seconds}         
</ui:repeat>

Output:

Hour: 8:10:11
Hour: 9:10:11
Hour: 10:10:11
Hour: 11:10:11

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