### 8.3.3. Sample Time-Based Expressions

A small sample of how time-based expressions can be used:

Example 8.1. True if now is any time in the year 2005

```<rule id="rule1">
<date_expression id="date_expr1" start="2005-001" operation="in_range">
<duration years="1"/>
</date_expression>
</rule>```

Example 8.2. Equivalent expression

```<rule id="rule2">
<date_expression id="date_expr2" operation="date_spec">
<date_spec years="2005"/>
</date_expression>
</rule>```

Example 8.3. 9am-5pm Monday-Friday

```<rule id="rule3">
<date_expression id="date_expr3" operation="date_spec">
<date_spec hours="9-16" days="1-5"/>
</date_expression>
</rule>```

Please note that the `16` matches up to `16:59:59`, as the numeric value (hour) still matches!

Example 8.4. 9am-6pm Monday through Friday or anytime Saturday

```<rule id="rule4" boolean-op="or">
<date_expression id="date_expr4-1" operation="date_spec">
<date_spec hours="9-16" days="1-5"/>
</date_expression>
<date_expression id="date_expr4-2" operation="date_spec">
<date_spec days="6"/>
</date_expression>
</rule>```

Example 8.5. 9am-5pm or 9pm-12am Monday through Friday

```<rule id="rule5" boolean-op="and">
<rule id="rule5-nested1" boolean-op="or">
<date_expression id="date_expr5-1" operation="date_spec">
<date_spec hours="9-16"/>
</date_expression>
<date_expression id="date_expr5-2" operation="date_spec">
<date_spec hours="21-23"/>
</date_expression>
</rule>
<date_expression id="date_expr5-3" operation="date_spec">
<date_spec days="1-5"/>
</date_expression>
</rule>```

Example 8.6. Mondays in March 2005

```<rule id="rule6" boolean-op="and">
<date_expression id="date_expr6-1" operation="date_spec">
<date_spec weekdays="1"/>
</date_expression>
<date_expression id="date_expr6-2" operation="in_range"
start="2005-03-01" end="2005-04-01"/>
</rule>```

Note

Because no time is specified with the above dates, 00:00:00 is implied. This means that the range includes all of 2005-03-01 but none of 2005-04-01. You may wish to write `end="2005-03-31T23:59:59"` to avoid confusion.

Example 8.7. A full moon on Friday the 13th

```<rule id="rule7" boolean-op="and">
<date_expression id="date_expr7" operation="date_spec">
<date_spec weekdays="5" monthdays="13" moon="4"/>
</date_expression>
</rule>```