Removing the first number on a numeric variable

[Starlight May]

Please help. I have a zip code variable but they all start with the number "5". How do I remove the "5"?
Here is the example:
500601
500602
500603
500606
I want to be able to have 5-digit zip codes with the five at the beginning removed; as '00601, 00602, 00603, 00606'

Thanks

[Joro Kolev]

Check whether it is not already a string, if it is not,

. tostring var, replace
var1 was long now str6

. gen five = substr(var,2,5)

if it is already a string, directly the second step.

[Starlight May]

Thank you Joro! Worked perfect

[Nick Cox]

tostring can be cut even if the conversion is needed. Consider

gen wanted = substr(string(var), 2, 5)

[Temilolu Bamiwuye]

Thanks Joro and Nick!
Please help, in a situation where i have state codes (234) and individual codes (1001). How do I remove the "234"?
Here is the example:
2341001
2341005
2341800
2341700

Instead of the above, I want to be able to have codes as "1001, 1005, 1800, 1700"

Thanks

[Nick Cox]

Your example in #6 leaves ambiguous whether the variable concerned is numeric or string. This is why we ask people to use dataex.

clear 
input long mynumvar str7 mystrvar 
2341001 "2341001"
2341005 "2341005"
2341800 "2341800"
2341700 "2341700"
end 

gen wanted1 = mod(mynumvar, 10000)
gen wanted2 = substr(mystrvar, 4, 4)

list

Results

. list 

     +-----------------------------------------+
     | mynumvar   mystrvar   wanted1   wanted2 |
     |-----------------------------------------|
  1. |  2341001    2341001      1001      1001 |
  2. |  2341005    2341005      1005      1005 |
  3. |  2341800    2341800      1800      1800 |
  4. |  2341700    2341700      1700      1700 |
     +-----------------------------------------+

[Temilolu Bamiwuye]

Thank you so much Nick, It worked perfectly