nl_tokens: Return the number of days in a month taking leapyear into account .
pl_tokens: function daysInMonth ( month , year ) { switch ( month ) { case 1 : <mask> 3 : case 5 : case 7 : case 8 : case 10 : case 12 : return 31 ; case 4 : case 6 : case 9 : case 11 : return 30 ; case 2 : var leapyear ; if ( year % 4 != 0 ) { leapyear = false ; } else if ( year % 100 != 0 ) { leapyear = true ; } else if ( year % 400 != 0 ) { leapyear = false ; } else { leapyear = true ; } if ( leapyear ) { return 29 ; } else { return 28 ; } default : throw new Error ( 'Unknown Month' ) ; } }