<p class="Paragraph">The year in the date details is often stated as two digits. Internally the year is managed by <help:productname>%PRODUCTNAME</help:productname> as four digits, so that in the calculation of difference from 1/1/99 to 1/1/01 the result will correctly be two years.</p>
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<p style="">Under <span style="font-weight:bold;">Tools - Options - <help:productname>%PRODUCTNAME</help:productname> - General</span> you can define up to which year a two-digit year "xx" should be displayed as "20xx".</p>
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<p class="Paragraph">This means that if you enter a date of 1/1/30 or higher, it will be treated internally as 1/1/1930 or higher. All lower years apply to the next century. So, for example, 1/1/20 is converted into 1/1/2020.</p>