[1][4][6] After the war, he wrote Šesté jaro [Sixth Spring], a 252-page book describing the years he spent in prison and containing photographs that he took shortly after liberation.

[7][8] Jírů's contemporaries, including the Czech writer Karel Konrád who wrote the preface to the second edition, characterized Šesté jaro as a dokumentární román ("documentary novel").

[8][9] A reviewer for Books Abroad wrote that Jírů's "sketchy, staccato manner is well fitted to a vigorous account of his six horrible years under the Nazis".

[7] He continued to work on several books and photography collections in the late 1940s: Raf (1947), Slunečné pobřeží Jugoslavie [The Sunny Coast of Yugoslavia] (1948), and Zrcadlo života [The Mirror of Life] (1949).

He chaired the editorial board of the magazine's successor, Československá fotografie, until 1957, and from 1954 to 1957 he was also the director of Tisková, ediční a propagační služba místního hospodářství, a Czech publishing house.