Time Comparison and Subtracting

[Former Member]

I have a requirement regarding time like i need to compare two time datatype fields, like Start time and End time, End time should not be greater than Start Time. Also Lunch break field will be entered in mins. So, now I need to display in a field Working = Start-End-Lunch. How can I subtract Time from Time and also Compare in Webdynpro Java

[Sharathmg · Accepted solution]

Its more w.r.t. plain old Java.

Look up in Java to use the Date/Time classes to subtract the times.

Check this link for some clue into time subtraction in Java.

http://www.mkyong.com/java/how-to-calculate-date-time-difference-in-java/

Regards,

Sharath

[Former Member · Accepted solution]

Thank you Sharath. Its working

[Former Member · Accepted solution]

Hi Sharath,

As you suggested I can subtract two times, but lunch also needs to be subtracted which is of integer type i.e. the user will enter in mins. Now, how can I subtract lunch time also from two times. Can you suggest.

[junwu · Accepted solution]

please spend some time looking at the date time api....

[Sharathmg · Accepted solution]

It should be simpler as the time to be subtracted should also be cast into Date class.

Check for converting integer to Date/Time. Then, subtract it similar to previous step.

Regards,

Sharath

[Former Member · Accepted solution]

Integer is not converting into Date/Time. Can you suggest another way.

[Sharathmg · Accepted solution]

Try to use the Calendar Instance object to subract times.

Check this link for your ref:

Add/Subtract Hours from Date with Calendar | Examples Java Code Geeks

Regards,

Sharath