1. i want to marry Mrs aouda tomorrow, the 23rd December.

2. i want to marry Mrs Aouda tomorrow, 23rd December.

3. i want to marry Mrs Aouda tomorrow, December 23rd.

4. i want to marry Mrs Aouda tomorrow, December the 23rd.

5. i want to marry Mrs Aouda tomorrow, December 23.
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Are they all grammatical? I saw the expression like Sentence one. Is this expression from British English?

1. I want to marry Mrs Aouda tomorrow, the 23rd December.

2. I want to marry Mrs Aouda tomorrow, 23rd December.

3. I want to marry Mrs Aouda tomorrow, December 23rd.

4. I want to marry Mrs Aouda tomorrow, December the 23rd.

5. I want to marry Mrs Aouda tomorrow, December 23.
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Are they all grammatical? I saw the expression like Sentence one. Is this expression from British English?

Yes, sentence 1 is phrased in British English. Sentences 3 and 4 are American English. The others are grammatically correct, but not commonly used.

All of the sentences you provided are grammatically correct. The differences in punctuation and word order are mainly stylistic choices and do not affect the overall meaning of the sentences. Here is a breakdown of each sentence:

1. "I want to marry Mrs Aouda tomorrow, the 23rd December."
This sentence is grammatically correct. It follows the British English convention of using "the" before the date (the 23rd of December) instead of the American English convention (December 23rd).

2. "I want to marry Mrs Aouda tomorrow, 23rd December."
This sentence is also grammatically correct. It omits the article "the" before the date but is still perfectly understandable.

3. "I want to marry Mrs Aouda tomorrow, December 23rd."
This sentence is grammatically correct and follows the American English convention of placing the month before the day.

4. "I want to marry Mrs Aouda tomorrow, December the 23rd."
This sentence is grammatically correct. It includes the article "the" before the date, which is a common usage in British English.

5. "I want to marry Mrs Aouda tomorrow, December 23."
This sentence is also grammatically correct. It follows the American English convention of placing the month before the day and omits the year.

Overall, the expressions you provided can be used in both British and American English, and the specific choice depends on personal preference or regional variations.