'時間戳常量
private const timezone_china as long = &h8 '中國(北京)時區[東八區]
private const timestamp_max as date = #1/19/2038 11:14:07 am# '時間戳最大值(&h7fffffff)
private const timestamp_min as date = #12/14/1901 4:45:52 am# '時間戳最小值(&h80000000)
'日期格式轉時間戳，預設加上東八區(北京時間)的時差
public function timestampfromdate(optional timestamp as date, optional timezone as long = timezone_china) as long
dim datetimestamp as date
if timestamp > timestamp_max or timestamp < timestamp_min then timestamp = now
datetimestamp = dateadd("h", -timezone, timestamp)
timestampfromdate = datediff("s", timestamp_base, datetimestamp)
end function
'時間戳轉日期格式，預設除去東八區(北京時間)的時差
public function timestamptodate(timestamp as long, optional timezone as long = timezone_china) as date
dim datetimestamp as date
datetimestamp = dateadd("s", timestamp, timestamp_base)
timestamptodate = dateadd("h", timezone, datetimestamp)
end function
private sub form_load()
debug.print "timestamptest", timestampfromdate(now), timestamptodate(timestampfromdate(now))
unload me
end sub
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