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I'm speaking of the noun having to do with an interval of time.

I need this for programming purposes and it appears some people use "time span" and others "timespan" so I assume both are correct.

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Haha I went with the word "interval" instead as that is the preferred word in Java. – Adam Gent Jul 17 '12 at 20:17
up vote 10 down vote accepted

Merriam-Webster doesn't have an entry for timespan. Time span is correct, as you are referring to a span of time. I could see the argument for both being correct, though, as many other "Y of X" are converted into single word XY in english.

For programmers, timespan is used because spaces are not allowed in many places. If you are speaking to programers, timespan will be understood.

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NGram shows that time span is used far more.

enter image description here

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Yes, but a significant proportion of the two-word instances are in fact hyphenated - a standard intermediate step when a word-pair is heading for single-word status. Personally, I'd normally have written it as two words 30 years ago. But today I'd always write it as one word (as with timeframe). – FumbleFingers Jul 17 '12 at 21:16

In "New Oxford Dictionary for Writers and Editors" I read (p. 386):

"time span", two words.

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Timespan is a word, but you're most likely talking to people who are used to the System.Timespan stucture or something similar.

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