View source: R/parse-datetime.r
A simpler, faster mungebit that takes Postgresql CreatedAt statements in the format of YYYY-MM-DD HH:MM:SS.SSSS and convert them into the choice of...
days since 1970 (default)
the hour of day (0-23, use mode="hod")
the day of week (Mon-Sun, use mode="dow")
the day of month (1-31, use mode="dom")
the day of year (1-365, use mode="doy")
the month of year (1-12 corresponding to Jan-Dec, use mode="moy") 
if the output is a holiday (TRUE or FALSE, use mode="holiday")
if the output is a weekend (TRUE or FALSE, use mode="weekend")
if the output is a business day (TRUE or FALSE, use mode="bizday")
1  | datetime_fn(createdat, mode = "since", permissive = FALSE)
 | 
mode | 
 gives the desired output format (see above)  | 
permissive | 
 logical. If false, will error with an improper type. If true, will just warn.  | 
date | 
 contains the date to be formatted  | 
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