http://www.smh.com.au/news/National/No-shirt-no-swim-rule-for-Qld-schools/2007/11/04/1194117859524.html

Queensland state primary students will be made to wear sun shirts while swimming from next year.

The state government said "rashie" shirts would become part of the primary school uniform code to boost to sun protection rules.

Ms Bligh said the only exception to wearing sun shirts would be during races at school swimming carnivals.

Ms Bligh said child-sized sun-shirts - which help block harmful UV rays - were now available at chain stores from $15, making them affordable for most parents.

In circumstances where parents can't afford them, children would still be required to wear a T-shirt in the water, she said.

All primary and secondary schools will have to provide a broad-spectrum, water-resistant sunscreen of SPF 30 or better for students as part of the new rules.

That's in the late evening, when it is safe to be outside without a shirt on (until the mozzies come).

They take it away from the morning.

They should still be in school at 3.

They are still in school, so it doesn't matter what the real time is.

In Queensland, virtually all schools finish for the day at approximately 3 pm. On daylight saving, school children right across the state would have no choice but to travel home at what is now 2 pm EST. According to the above graphs, the Brisbane UV level at 3 pm is '3' (moderate), while at 2 pm the level is '7' (high); in Townsville, the UV level at 3 pm is '5' (moderate) and at 2 pm '9' (very high). In terms of this data, the permanent shift in school children's going-home time from 3 pm to what is now 2 pm EST represents virtually double the UVR exposure risk.

To give another scenario: In Queensland, it is compulsory for schools to offer sport on at least one afternoon per week. Given that the average playing time for school sports matches across the state is between 1.30 pm and 2.30 pm, daylight saving would force these matches to be played between what is now 12.30 pm and 1.30 pm EST. According to the above data, the UV level in Brisbane at 1.30 pm is '7' (high) and at 12.30 pm, '10' (very high); in Townsville, the UV levels for these times are respectively '9' (very high) and '12' (extreme). Again, in terms of this data, the permanent shift of school sports matches from 1.30 pm to what is now 12.30 pm EST represents approximately a 30 per cent higher UVR exposure risk.

Source

They have to wear hats etc for school sport. They should wear them on the way home too. They don't have to jump in the pool straight after school. Most would head home for a feed first.

Now they have the option of playing early in the morning, when the UV readings are lowest.

I was never let out until after 3pm. By the time I got to the pool is was much later.

How long does it take to get sunburnt?

Sensitive skin can start to burn in as little as ten minutes during the middle of the day in an Australian midsummer, but the skin won’t begin to redden or show signs of burning for about another two to three hours. So if you stay in the sun until you’re already pink before applying some protection, you are already severely burnt. Apply sunscreen before going into the sun.

You haven't yet convinced me that this increases the risk of skin cancer.

Over exposure to ultraviolet radiation can cause short term health effects such as sunburn. Long term exposure to ultraviolet radiation can increase the risk of damage to the skin and eyes which may result in skin cancers and cataracts.