201904 += 'The Single UNIX Specification, version-3, known as SUSv3 or...

201904 += 'The Single UNIX Specification, version-3, known as SUSv3 or POSIX-2001, notes that for portability, the character string that identifies the timezone description should begin with a colon character.' <https://unix.stackexchange.com/a/48104/222284>