SEOUL, Jan 10 (Reuters) - U.S. President Donald Trump sent a happy birthday message to North Korean leader Kim Jong Un, South Korea's national security adviser Chung Eui-Yong said on Friday.

Chung, who met Trump in Washington this week, told reporters that he was given a message to pass to North Korea and it was delivered on Thursday.

Chung said on arriving back in South Korea that Trump had remembered the day they met was Kim Jong Un's birthday and had sent him birthday greetings.

"President Trump asked President Moon to deliver his message to Chairman Kim," said Chung, without elaborating whether it was a written message or whether it included anything beyond the greeting.

Kim's birthday is believed to be Jan. 8, though his secretive regime has never confirmed the date. The U.S. government lists Kim's birth year as 1984, making him 36 years old this year.

15 PHOTOS Kim Jong Un and Donald Trump See Gallery Kim Jong Un and Donald Trump U.S. President Donald Trump shakes hands with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY U.S. President Donald Trump and North Korea's leader Kim Jong Un leave after signing documents that acknowledge the progress of the talks and pledge to keep momentum going, after their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY U.S. President Donald Trump shakes hands with North Korea's leader Kim Jong Un after they signed documents that acknowledged the progress of the talks and pledge to keep momentum going, after their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst U.S. President Donald Trump and North Korea's leader Kim Jong Un walk during their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Anthony Wallace/Pool via Reuters TPX IMAGES OF THE DAY U.S. President Donald Trump and North Korea's leader Kim Jong Un attend a signing ceremony during a summit at the Capella Hotel on the resort island of Sentosa, Singapore June 12, 2018. REUTERS/Jonathan Ernst U.S. President Donald Trump and North Korea's leader Kim Jong Un walk during their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Anthony Wallace/Pool via Reuters U.S. President Donald Trump and North Korea's leader Kim Jong Un shake hands during the signing of a document after their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Susan Walsh/Pool via Reuters U.S. President Donald Trump and North Korea's leader Kim Jong Un react during their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Anthony Wallace/Pool via Reuters U.S. President Donald Trump and North Korea's leader Kim Jong Un look at each others before signing documents that acknowledge the progress of the talks and pledge to keep momentum going, after their summit at the Capella Hotel on Sentosa island in Singapore June 12, 2018. They are flanked by Kim Yo Jong, sister of North Korean leader Kim Jong Un, and U.S. Secretary of State Mike Pompeo. REUTERS/Jonathan Ernst U.S. President Donald Trump and North Korean leader Kim Jong Un walk in the Capella Hotel after their working lunch, on Sentosa island in Singapore June 12, 2018. Susan Walsh/Pool via Reuters U.S. President Donald Trump walks with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Kevin Lim/The Straits Times via REUTERS ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY U.S. President Donald Trump walks with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Kevin Lim/The Straits Times via REUTERS ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY U.S. President Donald Trump and North Korean leader Kim Jong Un react at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst TPX IMAGES OF THE DAY U.S. President Donald Trump gestures next to North Korea's leader Kim Jong Un before their bilateral meeting at the Capella Hotel on Sentosa island in Singapore June 12, 2018. REUTERS/Jonathan Ernst TOPSHOT - Pedestrians walk in front of a screen showing a news report displaying portraits of US President Donald Trump and North Korean leader Kim Jong Un, in Tokyo on June 12, 2018. - Trump and Kim have become on June 12 the first sitting US and North Korean leaders to meet, shake hands and negotiate to end a decades-old nuclear stand-off. (Photo by Martin BUREAU / AFP) (Photo credit should read MARTIN BUREAU/AFP/Getty Images) Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

On Wednesday, Chung also met the U.S. special envoy for North Korea, Stephen Biegun, and "reaffirmed close U.S.-ROK coordination on North Korea," State Department spokeswoman Morgan Ortagus said, using the initials for South Korea's official name the Republic of Korea.

The two also discussed recent events in the Middle East and their coordination on global security issues.

South Korean Foreign Minister Kang Kyung-wha will meet U.S. Secretary of State Mike Pompeo in California next week, along with their Japanese counterpart, Toshimitsu Motegi, and North Korea and South Korea-Japan relations will be on the top of the agenda.

South Korean President Moon Jae-in said on Tuesday there is an urgent need for practical ways to improve ties with North Korea, adding that he was ready to meet its reclusive leader in North Korea. (Reporting by Sangmi Cha; Editing by Alison Williams, Josh Smith)

More from :

Video appears to show moment Ukraine plane was shot down

President Trump addresses nation after Iran's retaliatory strike

Congress reacts to Iran attack on U.S. forces