ดูต้นฉบับสำหรับ มีเดียวิกิ:Apihelp-mergehistory-param-starttimestamp

Timestamp from which revisions will be moved from the source page's history to the destination page's history. If omitted, all revisions before the timestamp parameter (or the entire history if neither are specified) will be merged into the destination page. May specify "timestamp|revid" to split two revisions with the same timestamp.