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From CreationWiki, the encyclopedia of creation science

Calendar span is a measure of time that centers on the solar day as the base unit. This definition allows the storage of spans of time that are precise to one millisecond but can span all of human history. To use even more precise times, use the event span type, which stores time in seconds.

• 24 h,hr,hour,hours
• 1440 m,min,minute,minutes
• 86400 s,sec,second,seconds
• 86400000 ms,millisecond,milliseconds
• 1.42857142857142857E-001 wk,week,weeks
• 3.38631929713015E-002 mon,month,months (This is the synodic or new-moon-based month)
• 2.73790926497609E-003 yr,year,years (This is the tropical year)
• 2.73785078713210E-003 a,Jul yr,Julian year,Julian years (Used in astronomy)
• 2.73790926497609E-004 dec,decade,decades
• 2.73790926497609E-005 cent,century,centuries
• 2.73790926497609E-006 mill,millennium,millennia

This type supports no more units than these, because temporal history does not go back further than six millennia at present and is not likely to go for more than one or two millennia into the future.