Forward contract value at time t when you sell it

Why is the value of Forward Contract Zero if you sell it at time t: why not Vt(T)

  1. Buy Forward contract 0 at F0(T)
  • cash flow at time 0 =0
  • value at time t = Vt(T)
  • Cash flow at time T = ST - F0(T)

2 Sell Forward contract at t at Ft (T)

  • cash flow at time 0 = NA
  • value at time t = 0
  • Cash flow at time T = Ft(T) - ST

Thanks

It is Vt(T)