计算时间和日期差异(Calculating Time and Date difference)

 我目前正在编写一份报告来计算iReport中两个日期变量之间的TotalTimeDifference 。 
 
 我正在比较的两个变量是MO_DATECREATED和MO_DATECOMPLETED并且我试图只计算时间差。 
 
 我曾尝试设置一个变量，对两个变量进行简单的减法 - 当然，这根本没有奏效。 
 
 我会附上我目前拥有的照片，但我正在寻找比较两个变量（包含日期/时间）和打印出时间差异变量的方式。 
 
 例如：如果MO started at 1/2/15 12:55pm并completed at 1/3/15 1:55pm我想打印时间差或花费多少时间为25 hours 
 
 我如何在iReport中做到这一点？ 感谢您帮助新手！ 
 
 
 编辑答案后，我想展示的日子： 

I am currently writing a report to calculate the TotalTimeDifference between two date variables in iReport. 
 
The two variables that I am comparing are MO_DATECREATED and MO_DATECOMPLETED and I am trying to calculate the time difference only.
 
I have tried setting up a variable that does a simple subtraction of the two variables- and of course that has not worked at all.
 
I will attach photoes of what I currently have but I am looking for the way to compare the two variables (which contains date/time) and printing out a variables with the difference in time.
 
Example: If the MO was started at 1/2/15 12:55pm and completed at 1/3/15 1:55pm i want to print the time difference, or how long it took, as 25 hours
 
How can I do this in iReport? Thank you for helping out a newbie!
 
 
 
EDIT After answer, I would like to the show days to: 

原文：https://stackoverflow.com/questions/34661493