### 8.213 `SECNDS` — Time function

Description:
  `SECNDS(X)` gets the time in seconds from the real-time system clock. X is a reference time, also in seconds. If this is zero, the time in seconds from midnight is returned. This function is non-standard and its use is discouraged.
Standard:
  GNU extension
Class:
  Function
Syntax:
  `RESULT = SECNDS (X)`
Arguments:

  T | Shall be of type `REAL(4)`.
  X | Shall be of type `REAL(4)`.

Return value:
  None
Example:

                program test_secnds
                    integer :: i
                    real(4) :: t1, t2
                    print *, secnds (0.0)   ! seconds since midnight
                    t1 = secnds (0.0)       ! reference time
                    do i = 1, 10000000      ! do something
                    end do
                    t2 = secnds (t1)        ! elapsed time
                    print *, "Something took ", t2, " seconds."
                end program test_secnds