Add the month and take away the time of day?
Context:
“What are you doing?” said Agnes, tearing her gaze away from the corridor.
“Amazin', ”said Granny. "Some things is entered twice! And I reckon there's a page here where someone's added the month and taken away the time of day!”
Tips:
1. This is from the novel 'Maskerade' written by Terry Pratchett, one of the books from 'Discworld' series.
2. While reading the materials equivalent to account book, Agnes and Granny Weatherwax has discovered that someone is stealing money from the theatre, most likely it was done by the notorious Ghost.
Question:
What exactly did the Ghost falsify accounts here? What exactly does Granny mean by saying 'added the month and taken away the time of day'?

Question

Answer

That depends on the story and context. We don't know what it means since we haven't read the book.

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