in week commencing vs on week commencing

Both "in week commencing" and "on week commencing" are commonly used phrases, but they are used in slightly different contexts. "In week commencing" is more commonly used when referring to events or activities that will happen during a specific week, while "on week commencing" is often used in formal contexts to specify the exact week when something will occur.

Last updated: March 29, 2024 • 2723 views

This phrase is correct and commonly used when referring to events or activities that will happen during a specific week.

"in week commencing"

Use "in week commencing" when you want to indicate that something will occur during a particular week in the future.

Examples:

The project will start in week commencing June 14th.
The training sessions are scheduled in week commencing next Monday.

Show 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.
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?
Parliament will adopt a resolution on the Commission's priorities during the February plenary session (week commencing 21 February 2005).
Assumes a 3 h haemodialysis session three times a week commencing at least 12 h after administration of the last dose of emtricitabine.
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
Her first natural sleep in weeks.
But I haven't used my card in weeks.
Yours is the most intriguing and touching I've heard in weeks.
I didn't think that would happen in week one.
You put the sensors in weeks ago.
I looked like I hadn't slept in weeks.
Hasn't filled a straight in weeks.
I haven't slept in my bed in weeks.
We haven't seen a healthy human being in weeks.
First drama-free morning I've had in weeks.

Alternatives:

during the week commencing
at the beginning of the week commencing

This phrase is correct and often used in formal contexts to specify the exact week when something will occur.

"on week commencing"

Use "on week commencing" when you want to specify the specific week when an event or activity will take place, especially in formal or official communications.

Examples:

The meeting is scheduled on week commencing July 5th.
The report will be submitted on week commencing next Monday.

Show examples from the web [+]

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;
This report will be analysed by the IAEA board of directors at a meeting in the week commencing 8 September 2003.
Parliament will adopt a resolution on the Commission's priorities during the February plenary session (week commencing 21 February 2005).
Assumes a 3 h haemodialysis session three times a week commencing at least 12 h after administration of the last dose of emtricitabine.
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?
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
I refuse to go to bed on week-old sheets.
A loading dose of 160 mg Humira on Week 0 followed by 80 mg Humira on Week 2 achieves serum adalimumab trough concentrations of approximately 12 µg/ ml during the induction period.
I have to be on week in Havana and this whole thing will have blown over.
There will be no service on weeks falling entirely within the month of July.
Buckley's ledgers show interest inflated, week on week.
Not too often, on week ends mostly we went to the park in small groups.
You do one of those exposés on week you do the gambling connection.
Do not wear a patch on Week 4 (Day 22 through Day 28).
When used in combination with melphalan and prednisone, Velcade is given twice a week on weeks 1, 2, 4 and 5 of a six-week treatment cycle.
When used on its own, Velcade is given twice a week on weeks 1 and 2 of a three-week treatment cycle.

Alternatives:

during the week commencing
at the beginning of the week commencing

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in week commencing vs on week commencing