diff --git a/src/oceanic_atom2_parser.c b/src/oceanic_atom2_parser.c
index 674faea..d2cdc6f 100644
--- a/src/oceanic_atom2_parser.c
+++ b/src/oceanic_atom2_parser.c
@@ -119,20 +119,29 @@ oceanic_atom2_parser_get_datetime (parser_t *abstract, dc_datetime_t *datetime)
 	const unsigned char *p = abstract->data;
 
 	if (datetime) {
-		if (parser->model == 0x4258) {
-			// VT3
-			datetime->year  = ((p[3] & 0xE0) >> 1) + (p[4] & 0x0F) + 2000;
-			datetime->month = (p[4] & 0xF0) >> 4;
-			datetime->day   = p[3] & 0x1F;
-			datetime->hour  = bcd2dec (p[1] & 0x7F);
-		} else {
-			// Atom 2
-			datetime->year  = bcd2dec (((p[3] & 0xC0) >> 2) + (p[4] & 0x0F)) + 2000;
-			datetime->month = (p[4] & 0xF0) >> 4;
-			datetime->day   = bcd2dec (p[3] & 0x3F);
-			datetime->hour  = bcd2dec (p[1] & 0x1F);
+		switch (parser->model) {
+		case 0x434E: // OC1
+			datetime->year   = ((p[5] & 0xE0) >> 5) + ((p[7] & 0xE0) >> 2) + 2000;
+			datetime->month  = (p[3] & 0x0F);
+			datetime->day    = ((p[0] & 0x80) >> 3) + ((p[3] & 0xF0) >> 4);
+			datetime->hour   = bcd2dec (p[1] & 0x1F);
+			datetime->minute = bcd2dec (p[0] & 0x7F);
+			break;
+		case 0x4258: // VT3
+			datetime->year   = ((p[3] & 0xE0) >> 1) + (p[4] & 0x0F) + 2000;
+			datetime->month  = (p[4] & 0xF0) >> 4;
+			datetime->day    = p[3] & 0x1F;
+			datetime->hour   = bcd2dec (p[1] & 0x7F);
+			datetime->minute = bcd2dec (p[0]);
+			break;
+		default: // Atom 2
+			datetime->year   = bcd2dec (((p[3] & 0xC0) >> 2) + (p[4] & 0x0F)) + 2000;
+			datetime->month  = (p[4] & 0xF0) >> 4;
+			datetime->day    = bcd2dec (p[3] & 0x3F);
+			datetime->hour   = bcd2dec (p[1] & 0x1F);
+			datetime->minute = bcd2dec (p[0]);
+			break;
 		}
-		datetime->minute = bcd2dec (p[0]);
 		datetime->second = 0;
 
 		// Convert to a 24-hour clock.