fix start timestamp in sentence_info (#2024)

lingji-yidong

2024-08-19 f43da18b5e097515c12438c70fc7918c29e5d0c8

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jan    january
feb    february
mar    march
apr    april
jun    june
jul    july
aug    august
sep    september
sept    september
oct    october
nov    november
dec    december