at the week commencing vs on the week commencing

Some examples from the web:

• This report will be analysed by the IAEA board of directors at a meeting in the week commencing 8 September 2003.
• Weeks commencing in June and September 700.00 euros.
• They will return week commencing Monday 5 September 2016.
• Parliament will adopt a resolution on the Commission's priorities during the February plenary session (week commencing 21 February 2005).
• Can the European Council make a statement as to the success or otherwise of the UN Convention on Climate Change which was held in Montreal in Canada the week commencing 5 December last?
• Assumes a 3 h haemodialysis session three times a week commencing at least 12 h after administration of the last dose of emtricitabine.
• However, Chrome 15 overtook IE8 for the first time during the five day working week, in week commencing 5th December, he added.
• Home > Events > Maritime Week commencing at the Weser 26. September to 3. October 2010
• for a period of six weeks commencing on the first day of trading of the financial instrument where the assessment is carried out pursuant to paragraph 1(a) of this Article;
• Oestrous cycles for all F1 females in cohort 1A should also be monitored for a period of two weeks, commencing around PND 75.
• At 16 weeks after commencing Xolair therapy patients should be assessed by their physician for treatment effectiveness before further injections are administered.
• at least one week prior to it commencing
• A pre-incubation period of at least two weeks is necessary before commencing transformation studies (see section 1.8.3.2).
• Should non-live vaccinations be required whilst receiving MabThera therapy, these should be completed at least 4 weeks prior to commencing the next course of MabThera
• At The Week, Damon Linker listed nine ridiculous claims in that cover story.
• I've had a succession of computer issues and an illness, it's going really well and I'll be mailing some chapters at the week.
• Find out why, and read more about the EP's schedule in our look at the week ahead.
• Be aware also that there are places and countries where Salsa dancing is more of a popular activity that is done at the week-end, without taking any lessons and with doing just basic steps (like in Colombia).
• For lunch at the week-end why not stay in town and sample the typical Bosses ham at the Privé et Parisien restaurant (Panorama 1/A).
• With foot or vélo, you will be able to discover the basin of Arcachon and the Atlantic. Various formulas of hirings at the week - country cottages - mobil-homes.

Some examples from the web:

• Weeks commencing in June and September 700.00 euros.
• This report will be analysed by the IAEA board of directors at a meeting in the week commencing 8 September 2003.
• They will return week commencing Monday 5 September 2016.
• Parliament will adopt a resolution on the Commission's priorities during the February plenary session (week commencing 21 February 2005).
• Can the European Council make a statement as to the success or otherwise of the UN Convention on Climate Change which was held in Montreal in Canada the week commencing 5 December last?
• Assumes a 3 h haemodialysis session three times a week commencing at least 12 h after administration of the last dose of emtricitabine.
• However, Chrome 15 overtook IE8 for the first time during the five day working week, in week commencing 5th December, he added.
• Home > Events > Maritime Week commencing at the Weser 26. September to 3. October 2010
• for a period of six weeks commencing on the first day of trading of the financial instrument where the assessment is carried out pursuant to paragraph 1(a) of this Article;
• Oestrous cycles for all F1 females in cohort 1A should also be monitored for a period of two weeks, commencing around PND 75.
• At 16 weeks after commencing Xolair therapy patients should be assessed by their physician for treatment effectiveness before further injections are administered.
• at least one week prior to it commencing
• A pre-incubation period of at least two weeks is necessary before commencing transformation studies (see section 1.8.3.2).
• Should non-live vaccinations be required whilst receiving MabThera therapy, these should be completed at least 4 weeks prior to commencing the next course of MabThera
• For more information on the week in Strasbourg see the links below.
• Jinkee gets down on the week before the fight.
• On the week-ends you can choose among several clubs.
• Daniel Hannan on the week's agenda and
• Thursday: The final items on the week's agenda are voted on around midday (between 1100 and 1300).
• So, Trav asked me if I thought it was a problem that all we do on the week-end is sit around and drink wine.