1. Christian Era
  2. Julian Calendar
  3. Gregorian Calendar
  4. Saka Era
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Answer: Option 3

Gregorian Calendar is being universally followed. The Gregorian calendar is a solar calendar with 12 months of 28-31 days each. A regular Gregorian year consists of 365 days, but in certain years known as leap years, a leap day is added to February.

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