diff --git a/libpldm/bios.c b/libpldm/bios.c
new file mode 100644
index 0000000..c757df3
--- /dev/null
+++ b/libpldm/bios.c
@@ -0,0 +1,88 @@
+#include <endian.h>
+#include <string.h>
+
+#include "bios.h"
+
+int encode_get_date_time_req(uint8_t instance_id, struct pldm_msg *msg)
+{
+	struct pldm_header_info header = {0};
+
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	header.msg_type = PLDM_REQUEST;
+	header.instance = instance_id;
+	header.pldm_type = PLDM_BIOS;
+	header.command = PLDM_GET_DATE_TIME;
+	return pack_pldm_header(&header, &(msg->hdr));
+}
+
+int encode_get_date_time_resp(uint8_t instance_id, uint8_t completion_code,
+			      uint8_t seconds, uint8_t minutes, uint8_t hours,
+			      uint8_t day, uint8_t month, uint16_t year,
+			      struct pldm_msg *msg)
+{
+	struct pldm_header_info header = {0};
+	int rc = PLDM_SUCCESS;
+
+	if (msg == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	msg->body.payload[0] = completion_code;
+
+	header.msg_type = PLDM_RESPONSE;
+	header.instance = instance_id;
+	header.pldm_type = PLDM_BIOS;
+	header.command = PLDM_GET_DATE_TIME;
+	if ((rc = pack_pldm_header(&header, &(msg->hdr))) > PLDM_SUCCESS) {
+		return rc;
+	}
+
+	uint8_t *dst = msg->body.payload + sizeof(msg->body.payload[0]);
+
+	memcpy(dst, &seconds, sizeof(seconds));
+	dst += sizeof(seconds);
+	memcpy(dst, &minutes, sizeof(minutes));
+	dst += sizeof(minutes);
+	memcpy(dst, &hours, sizeof(hours));
+	dst += sizeof(hours);
+	memcpy(dst, &day, sizeof(day));
+	dst += sizeof(day);
+	memcpy(dst, &month, sizeof(month));
+	dst += sizeof(month);
+	uint16_t local_year = htole16(year);
+	memcpy(dst, &local_year, sizeof(local_year));
+
+	return PLDM_SUCCESS;
+}
+
+int decode_get_date_time_resp(const struct pldm_msg_payload *msg,
+			      uint8_t *completion_code, uint8_t *seconds,
+			      uint8_t *minutes, uint8_t *hours, uint8_t *day,
+			      uint8_t *month, uint16_t *year)
+{
+	if (msg == NULL || seconds == NULL || minutes == NULL ||
+	    hours == NULL || day == NULL || month == NULL || year == NULL ||
+	    completion_code == NULL) {
+		return PLDM_ERROR_INVALID_DATA;
+	}
+
+	*completion_code = msg->payload[0];
+	if (PLDM_SUCCESS != *completion_code) {
+		return PLDM_SUCCESS;
+	}
+	const uint8_t *start = msg->payload + sizeof(uint8_t);
+	*seconds = *start;
+	*minutes = *(start + sizeof(*seconds));
+	*hours = *(start + sizeof(*seconds) + sizeof(*minutes));
+	*day = *(start + sizeof(*seconds) + sizeof(*minutes) + sizeof(*hours));
+	*month = *(start + sizeof(*seconds) + sizeof(*minutes) +
+		   sizeof(*hours) + sizeof(*day));
+	*year = le16toh(
+	    *((uint16_t *)(start + sizeof(*seconds) + sizeof(*minutes) +
+			   sizeof(*hours) + sizeof(*day) + sizeof(*month))));
+
+	return PLDM_SUCCESS;
+}