The gilded coin of the sun rises with the dawn dispelling the dark granting a new day. Each day is a new day. Each moment is the only moment. All the wise people throughout time have said this. Unsurprisingly, so did Jesus of Nazareth. As a young man, no more than a child, Yesu travelled with his adoptive father, Yoseph, down the Silk Road to a Buddhist monastery in Northern India, in the Himalayas. He studied there from 11 until around his 29th birthday. Buddhist's do not try to convert others to their philosophy so Yesu remained a Hebrew, a Jew but learned much of the philosophy he had first encountered as a child in the Middle East. There are many references to his fondness of the Buddhist practice notably this from Matthew 6.34...
"So do not worry about tomorrow; it will have enough worries of its own. There is no need to add to ... be concerned for itself. A day's own trouble is sufficient for it. ... “Therefore do not be anxious for tomorrow; for tomorrow will care for itself. Each day has ... give I unto you. Let not your heart be troubled, neither let it be afraid." - Jesus of Nazareth
As clear a reference as you could wish for from the Christian Messiah to live in the now.