diff --git a/src/JJYReceiver.h b/src/JJYReceiver.h
index f69cec4..91d66cf 100644
--- a/src/JJYReceiver.h
+++ b/src/JJYReceiver.h
@@ -163,7 +163,7 @@ class JJYReceiver {
         uint16_t year, yday;
                 year = (((jjydata[index].bits.year & 0xf0) >> 4) * 10 + (jjydata[index].bits.year & 0x0f)) + 2000;
         timeinfo.tm_year  = year - 1900; // 年      
-        yday = ((((jjydata[index].bits.doyh >> 5) & 0x0002)) * 100) + (((jjydata[index].bits.doyh & 0x000f)) * 10) + jjydata[index].bits.doyl;
+        yday = ((((jjydata[index].bits.doyh >> 5) & 0x0003)) * 100) + (((jjydata[index].bits.doyh & 0x000f)) * 10) + jjydata[index].bits.doyl;
         calculateDate(year, yday ,(uint8_t*) &timeinfo.tm_mon,(uint8_t*) &timeinfo.tm_mday);
         timeinfo.tm_hour  = ((jjydata[index].bits.hour >> 5) & 0x3) * 10 + (jjydata[index].bits.hour & 0x0f) ;         // 時
         timeinfo.tm_min   = ((jjydata[index].bits.min >> 5) & 0x7)  * 10 + (jjydata[index].bits.min & 0x0f) + offset;          // 分