How to days count of number in days

[THENNA_41]

i have three column  Deilviery date ,proposedate ,Timecov.   i want to  TImecov  number  to  propose date .  if any blank row in porposedate   its take delivery date column 

Delivery                Proposedate                Timecov                                      

15 sep 2019         10 sep 2019                    7 
16 sep 2019         10 sep 2019                    7 
05 june 2020                                               30 
15 July 2019         10 sep 2020                   45
15 sep 2019         10 sep 2021                    21 

Output:

Delivery                Proposedate                Timecov                     OSS date                  

15 sep 2019         10 sep 2019                    7                            17-sep-2019
16 sep 2019         10 sep 2019                    7                            17-sep-2019
05 june 2020                                               30                           05 july 2020
15 July 2019         10 sep 2020                   45                            25 oct 2020
15 sep 2019         10 sep 2021                    20                           30 sep 2021

any idea.its possible in dax ? i am looking for support . i am tired DATEADD fucntion i am getting Error 

Thanks 

[THENNA_41]

@Greg_Deckler   ya  i want to apply  above formula only for three overdue  types only ..Thanks Now working 

[Greg_Deckler]

@THENNA_41 Try:

OSS date column = 
  IF(ISBLANK([Proposedate]),[Delivery]+VALUE([Timeconv]),[Proposedate]+VALUE([Timeconv]))

[THENNA_41]

@Greg_Deckler  its working perfect thanks .  how i will filter on this  above query 

i have   Overdue  column  name 

Overdue

Close Po 

Standard overdue 

Old overdue 
UrgentOverdue
Purchase OVR 

i want above apply only  Standard overdue ,Old overdue ,UrgentOverdue . please how i  will this filter above query 

[Greg_Deckler · Accepted solution]

@THENNA_41 If I understand correctly, then something like:

OSS date column = 
  IF([Overdue] = "Standard overdue" || [Overdue] = "Old overdue" || [Overdue] = "UrgentOverdue",
    IF(ISBLANK([Proposedate]),[Delivery]+VALUE([Timeconv]),[Proposedate]+VALUE([Timeconv])),
    BLANK()
  )