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/GNU Fortran 7

9.235 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

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/SECNDS.html