A Guide on as.Date() — How to set argument <format = ““>
%a = Abbreviated weekday
%A = Full weekday
%b = Abbreviated month
%B = Full month
%c = Locale-specific date and time
%d = Decimal date
%H = Decimal hours (24 hour)
%I = Decimal hours (12 hour)
%j = Decimal day of the year
%m = Decimal month
%M = Decimal minute
%p = Locale-specific AM/PM
%S = Decimal second
%U = Decimal week of the year (starting on Sunday)
%w = Decimal Weekday (0 = Sunday)
%W = Decimal week of the year (starting on Monday)
%x = Locale-specific Date
%X = Locale-specific Time
%y = 2-digit year
%Y = 4-digit year
%z = Offset from GMT
%Z = Time zone (character)