"commence as of" is a correct and usable phrase in written English.
You can use this phrase to refer to the starting point of something beginning. For example, "The new regulations will commence as of April 1st."
On Saturday, the baking of enough fresh bread will commence, as will — with the aid of oars — the spreading.
The company expects tests with a human crew could commence as early as the end of this year.
Each officer and cell would be given orders and would commence as soon as the shelling of al-Badr's palace began.
Therefore, treatment of ankylosis should commence as soon as patient's co-operation after the operation is expected.
However, because IMT transcription from the phaseolin promoter did not commence as early as in the case of transgenic tobacco, it was not possible to assess such differences.
The transcription and thematic analysis of interviews will commence as soon as possible after the first interview to enable the project team to determine when and/or whether a thematic 'saturation point' is reached.
The aim was for enrolment to be pursued at the earliest opportunity so that, if an enrolled patient were allocated to receive HBO, then the first session would be able to commence as soon as possible after completion of initial surgery.
Moreover, therapy should commence as early as possible before the development of detrimental discrepancies [25].
Antituberculous therapy should be commenced as soon as a diagnosis of pericarditis is made in a setting with high prevalence of TB and HIV infection.
The down-regulation of mitochondrial genes commenced as early as 48 H following immobilization.
In this way, the process of data analysis commenced as soon as data collection began, and our early analytical assumptions were pursued in the on-going data collection.
