<includeonly>{{DecadesAndYears/decaswitch|{{{1}}}|{{{2}}}|{{#expr:({{{3}}}-4.5)*{{#ifeq:{{{4}}}|AD|1|-1}}-5.5+{{{2}}}*10}}|{{{4}}}}}</includeonly><noinclude>
This subtemplate creates a row for the table even for the first century (AD or BC).
*{{{1}}} = namespace 
*{{{2}}} = century 
*{{{3}}} = row number (from −1 to 10)
*{{{4}}} = epoch AD or BC</noinclude>