Used to be, people tried to keep it out of the lawn! I remember Grampa fighting a large patch by the curb every year. We loved it, cause we could make fairy jewelry out of the flowers. Once he had 3 teary eyed granddaughters upset he had mowed down the flowers before we could pick them.. he felt so bad he decided he could live with the clover if it made us happy. Used to have a picture somewhere of him wearing a flower crown and necklace and rings made of clover flowers.. it was beautiful. and he's probably rolling in his grave cause I'm giving out the family secrets. he was such a softie on the inside. 
on edit:
Spring is the best time to seed To establish clover in existing sod, sow the seed in spring or early fall. Early to mid-April before grass starts growing quickly is the best time because there is little moisture stress and little competition from grass and other broadleaf plants. Clover seed can even be 'frost seeded' in late March or early April on ground that is still mostly frozen; the seed drops into small cracks as the surface alternately thaws during the day and freezes again at night. Early sown seed will germinate when the soil starts to warm up in latter part of April (in HRM).
Late summer/early fall is an alternative time, but is not as good as the spring because the less developed plants (compared to spring-seeded plants) are more likely to be winter-killed. If it's late summer and you're anxious to see some clover on the lawn, seed it then and again in late May or early June of the following year if you don't see good establishment of the fall seeded clover.
http://www.versicolor.ca/lawns/docs/clover.html
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