If the year has more than three digits , only the three low - order digits appear in the result 的年份。忽略年的前两位数字。
If the year has more than two digits , only the two low - order digits appear in the result 如果年份是一位数字( 1 - 9 ) ,则它显示为一位数字。
If the year has more than two digits , only the two low - order digits appear in the result . if the year has fewer than two digits , the number is padded with leading zeroes to achieve two digits 如果“ y ”格式说明符与其他自定义格式说明符或“ % ”字符一起传递,则它被解释为自定义格式说明符。