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<div class="section" id="dates-and-clocks">
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<div class="line">Because ecFlow was designed with ECMWF suites in mind, the date is a very important notion.</div>
<div class="line">ecFlow defines the time using clocks. A <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-clock"><em class="xref std std-term">clock</em></a> is an attribute of a <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-suite"><em class="xref std std-term">suite</em></a>.</div>
<div class="line">Different suites can have different clocks.</div>
<div class="line">There are two kinds of clocks:</div>
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<li><a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-real-clock"><em class="xref std std-term">real clock</em></a></li>
<li><a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-hybrid-clock"><em class="xref std std-term">hybrid clock</em></a></li>
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<div class="line">A suite clock can be modified by a gain. This is useful for suites running on older</div>
<div class="line">data (e.g. cleaning up old data).</div>
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<div class="line">The value of the date is in the generated <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-variable"><em class="xref std std-term">variable</em></a> ECF_DATE, and the value of the time is in ECF_TIME.</div>
<div class="line">ECF_CLOCK contains other information such as the day of week.</div>
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<div class="line">It is safer for a job to always use the suite generated time and date <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-variable"><em class="xref std std-term">variable</em></a>&#8216;s,</div>
<div class="line">and not access directly the system date to prevent confusion.</div>
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<p><strong>What to do:</strong></p>
<ol class="arabic simple">
<li>Try to modify the <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-suite"><em class="xref std std-term">suite</em></a> to run with a <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-clock"><em class="xref std std-term">clock</em></a> date from the previous week use :<a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-ecflow-client"><em class="xref std std-term">ecflow_client</em></a> &#8211;alter</li>
<li>Check the values of the ecFlow <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-variable"><em class="xref std std-term">variable</em></a>&#8216;s</li>
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<div class="admonition note">
<p class="first admonition-title">Note</p>
<ul class="last simple">
<li>The attributes <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-date"><em class="xref std std-term">date</em></a>, <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-day"><em class="xref std std-term">day</em></a> and <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-clock"><em class="xref std std-term">clock</em></a> are currently not usable if you choose to use a <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-repeat"><em class="xref std std-term">repeat</em></a> date type structure.</li>
<li>Be aware that <a class="reference internal" href="/wiki/display/ECFLOW/Glossary#term-cron"><em class="xref std std-term">cron</em></a> with a single time dependency will automatically resubmit indefinitely</li>
<li>Altering the clock, requires that the suite is re-queued</li>
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