Convert the Time to a lexicographically sortable string with the required precision. The format used is %Y%m%d %H:%M:%S.
the precision required in the string version of the time. The options are :year, :month, :day, :hour, :minute and :second
a lexicographically sortable string representing the date
# File lib/ferret/number_tools.rb, line 106 def to_s_lex(precision = :day) self.strftime(LEX_FORMAT[precision]) end