Today is the 17th of Tammuz, the beginning of the three week period of mourning remembering the Holy Temples (first and second) in Jerusalem. It's also a fast day that starts in the morning (early) and ends late (since sundown is so late). Even if you do not fast, please take a moment to read these websites - understand why this three week period ending with Tisha b'Av is so central to the Jewish People.
ABCs of Tisha B'Av & the Three Weeks - Rabbi Shraga Simmons (aish.org)
Tammuz: Forces of Nature - Rebbitzen Tziporah Heller
Tisha B'Av and the 3 Weeks - Destruction & Renewal - chabad.org