'Add date-time quarters in a new column in R

I have a dataframe in R named 'df' that correspondes to the 1st quarter in 2018, I have no information about any date inside of the dataframe, so, I need to create a new variable called 'period' that shows the data are in the 1st quarter in 2018 for all rows. Thank you

r time-series lubridate

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'Add date-time quarters in a new column in R

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