72 lines
4.9 KiB
HTML
72 lines
4.9 KiB
HTML
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Rules for date, time, and timestamp arithmetic" />
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<meta name="abstract" content="The only arithmetic operations that can be performed on date and time values are addition and subtraction. If a date or time value is the operand of addition, the other operand must be a duration. This topic describes rules for performing date, time and timestamp arithmetic." />
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<meta name="description" content="The only arithmetic operations that can be performed on date and time values are addition and subtraction. If a date or time value is the operand of addition, the other operand must be a duration. This topic describes rules for performing date, time and timestamp arithmetic." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Rules for date, time, and timestamp arithmetic</title>
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</head>
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<body id="rbafodttarul"><a name="rbafodttarul"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Rules for date, time, and timestamp arithmetic</h1>
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<div><p>The only arithmetic operations that can be performed on date and
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time values are addition and subtraction. If a date or time value
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is the operand of addition, the other operand must be a duration. This topic
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describes rules for performing date, time and timestamp arithmetic.</p>
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<div class="p"> The specific rules governing the use of the addition operator with date
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and time values follow: <ul><li>If one operand is a date, the other operand must be a date duration or
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a labeled duration of years, months, or days.</li>
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<li>If one operand is a time, the other operand must be a time duration or
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a labeled duration of hours, minutes, or seconds.</li>
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<li>If one operand is a timestamp, the other operand must be a duration. Any
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type of duration is valid.</li>
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</ul>
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</div>
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<div class="p">The rules for the use of the subtraction operator on date and time values
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are not the same as those for addition because a date or time value cannot
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be subtracted from a duration, and because the operation of subtracting two
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date and time values is not the same as the operation of subtracting a duration
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from a date or time value. The specific rules governing the use of the subtraction
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operator with date and time values follow: <ul><li>If the first operand is a date, the second operand must be a date, a date
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duration, a string representation of a date, or a labeled duration of years,
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months, or days.</li>
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<li>If the second operand is a date, the first operand must be a date or a
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string representation of a date.</li>
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<li>If the first operand is a time, the second operand must be a time, a time
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duration, a string representation of a time, or a labeled duration of hours,
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minutes, or seconds.</li>
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<li>If the second operand is a time, the first operand must be a time or string
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representation of a time.</li>
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<li>If the first operand is a timestamp, the second operand must be a timestamp,
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a string representation of a timestamp, or a duration.</li>
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<li>If the second operand is a timestamp, the first operand must be a timestamp
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or a string representation of a timestamp.</li>
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</ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbafodttaopq.htm" title="Date, time, and timestamp values can be incremented, decremented, and subtracted. These operations might involve decimal numbers called durations. These topics include a definition of durations and a specification of the rules for performing arithmetic operations on date, time, and timestamp values.">Perform date, time, and timestamp arithmetic using the Open Query File (OPNQRYF) command</a></div>
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</div>
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</div>
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</body>
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