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| <title>The GNU Fortran Compiler: SECNDS</title> |
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| <a name="SECNDS-_002d_002d_002d-Time-function"></a> |
| <h3 class="section">8.213 <code>SECNDS</code> — Time function</h3> |
| <a name="index-SECNDS"></a> |
| <a name="index-time_002c-elapsed-3"></a> |
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| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>SECNDS(X)</code> gets the time in seconds from the real-time system clock. |
| <var>X</var> 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. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>GNU extension |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>RESULT = SECNDS (X)</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>T</var></td><td width="70%">Shall be of type <code>REAL(4)</code>.</td></tr> |
| <tr><td width="15%"><var>X</var></td><td width="70%">Shall be of type <code>REAL(4)</code>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>None |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">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 |
| </pre></div> |
| </dd> |
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