in the end of may vs on the end of May

Some examples from the web:

• The European Parliament gave its "green light" for the legislative package in the beginning of April and the measures stipulated in it started to take effect already in the end of May.
• May I also add that I hope to be in Alicante myself at the end of May to speak at a conference.
• Finally, the informal ministerial meeting which took place in Leipzig at the end of May 2007 requested the Commission to present a report on territorial cohesion in 2008.
• Any such conference would certainly take place very close to the EU-Latin America summit in mid-May 2006 and to the presidential elections in Colombia at the end of May.
• She has not been seen for many days, in fact since the end of May, when it was reported that up to 70 people were killed by the junta army and that she suffered a head injury.
• It should also be noted that the Austrian Presidency has announced its intention of organising a conference on the subject of the pay gap in Brussels at the end of May, and I think it will be quite a special opportunity for making new progress in this field.
• Austria would like to continue its involvement in this wider context, and has already invited the High Level Group on the alliance of civilisations to hold its third meeting in Vienna at the end of May.
• Indeed, I would like to tell Parliament that just yesterday afternoon, the Commission adopted a related statement and the Council on Energy will debate the subject in detail at the end of May.
• Madam President, Commissioner, ladies and gentlemen, I am actually against waste incineration because I believe that it does not solve the problem, it merely shifts it elsewhere, and in the end the volume of waste may be reduced a little but does not disappear.
• In addition, since the end of May 2003, the Commission has published, on the Internet, summary reports containing information on all notifications received on a weekly basis.
• In the period from January-end of May 2009, compared to the same period last year, there is a reduction of 50 % in the number of exceptions.
• Similar requirements have been included in the End-of-Life Vehicles Directive.
• There is no meaning in the end of life.
• One Sunday afternoon in the end of July 1925.
• She leaves New York in the end of the week.
• The restrictions in the End-of-Life Vehicles Directive also continue to apply, so the provisions are there.
• And in the end it will be the end of all life on Earth.
• The tragedy of this place is that everybody knows exactly what would be the solution in the end, the end of the story.
• I was hoping to go and see her in the end of day.
• Like Lincoln in the end of the movie, spoiler alert.

Some examples from the web:

• It is anticipated that an agreement will be reached at the Security Council on this issue by the end of May.
• Mr Tarhan went on hunger strike at the end of May.
• There was an item about this on Europarl-TV at the end of May 2010.
• The UN Security council is expected to vote on the issue before the end of May, thus ending a long transitional period after the international military intervention of 1999.
• The opinions of the specialised committees should be delivered at latest by the end of May.
• The share was delisted at the end of May.
• Interested parties were invited to provide their opinions before the end of May 2011.
• A ruling is expected at the end of May.
• At the end of May 2010 the club was audited by the EU.
• Yet it is now the end of May 2008.
• The first payment of financial compensation to Mauritius was made at the end of May 1997.
• This will be done at the end of April/beginning of May 1998.
• I thought it only came in little chunks on the end of toothpicks.
• A razor on the end of a toothbrush.
• Never brought on the end of the world, though.
• Wimbledon with barriers like that on the end of your arm.
• This shovel's got trace on the end of it.
• They gave me a few minutes on the end of his day.
• We found this fragment on the end of her last tape.
• Pasted on the end of one of these slugs.