If you do pass your own am/pm strings, the “”t”” and “”tt”” format characters will have the same effect on them (producing single character vs. multiple character strings).
Kama huna kupita masharti yako mwenyewe am / jioni, “”t”” na “”tt”” wahusika format itakuwa na athari sawa juu yao (kuzalisha single tabia vs masharti tabia nyingi).