Need help to write custom function between cell current value minus previous value based on Date

[gaurav8591]

Dear Team,

I need help to populate new coloum as i have column A i have Day , Column B i have values so i want substraction of Cell 1 - cell 2

can you help me to write measure query. I have tried it but still not worked successfully

Date	ValueA	ValueB	OutputA	OutputB
21	155360	-440288	-184940	63649
20	340300	-503937	186159	-10802
19	154141	-493135	199198	-128607
18	-45057	-364528	118533	-352567
17	-163590	-11961

[gaurav8591]

@Qiuyun Yu : Can you help here