https://github.com/ujmp/universal-java-matrix-package/blob/479a90c12541149951cc4888ca9dc09bd01ab4bf/ujmp-core/src/main/java/org/ujmp/core/util/UJMPFormat.java#L72 mm stands for "Minute in hour" should be MM for "Month in year"
universal-java-matrix-package/ujmp-core/src/main/java/org/ujmp/core/util/UJMPFormat.java
Line 72 in 479a90c
mm stands for "Minute in hour"
should be MM for "Month in year"