我在Log Parser中转换Excel序列日期（OA日期）。
我有这个问题：
SELECT TOP 10
Field1 as ExcelSerialDate, /* days since 1900-01-01 */
to_timestamp('1900-01-01 00:00:00', 'yyyy-MM-dd hh:mm:ss') as BaseDate,
mul(sub(to_real(Field1),2.0),86400.0) as SecondsFromBase,
add(to_localtime(to_timestamp('1900-01-01 00:00:00', 'yyyy-MM-dd hh:mm:ss')),
to_timestamp(mul(sub(to_real(Field1),2.0),86400.0))) as Date
FROM 'MyData.txt'
其中MyData.txt每行只包含一个Excel序列日期：
ExcelSerialDate
42397.6668676968
42397.6663989236
42397.664126875
42397.6668321065
42397.6668733565
42397.6668907523
42397.6668711921
42397.6657181597
42397.666233044
42397.6654758681 ...
它提供输出
ExcelSerialDate BaseDate SecondsFromBase Date
42397.6668676968 01/01/00 12:00:00 AM 3662985617.369 28/01/16 04:00:17 PM
42397.6663989236 01/01/00 12:00:00 AM 3662985576.867 28/01/16 03:59:36 PM
42397.664126875 01/01/00 12:00:00 AM 3662985380.562 28/01/16 03:56:20 PM
42397.6668321065 01/01/00 12:00:00 AM 3662985614.294 28/01/16 04:00:14 PM
42397.6668733565 01/01/00 12:00:00 AM 3662985617.858 28/01/16 04:00:17 PM
42397.6668907523 01/01/00 12:00:00 AM 3662985619.361 28/01/16 04:00:19 PM
42397.6668711921 01/01/00 12:00:00 AM 3662985617.671 28/01/16 04:00:17 PM
42397.6657181597 01/01/00 12:00:00 AM 3662985518.049 28/01/16 03:58:38 PM
42397.666233044 01/01/00 12:00:00 AM 3662985562.535 28/01/16 03:59:22 PM
42397.6654758681 01/01/00 12:00:00 AM 3662985497.115 28/01/16 03:58:17 PM
这是正确的。
这是最好的方法吗？在创建时间戳并将其添加到1900-01-01的基准日期之前，我有两天从序列日期减去2天，这似乎违反直觉。