Here's some perspective on the age of various calendars:


[Starting Year of Calendar] [Elapsed Julian Days]
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[ Right Now ]-
Burroughsian2,440,500
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Poundian2,422,900
Thelemic2,416,500
'Pataphysical2,405,400
Baha'i2,394,600
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French Revolutionary2,375,800
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Zoroastrian1,951,000
Islamic1,948,400
Jalaali1,948,300
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Indonesian1,750,000
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Gregorian1,721,400
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Babylonian1,448,000
Julian1,446,000
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Erisian1,289,000
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Chinese1,007,000
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Tibetan942,000
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Hindu588,000
Mayan584,200
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Hebrew347,900
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Illuminati260,400
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Egyptian172,000
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Julian Day Number0