The effective date is a date that applies to per diem rates.  It is important because it shows the first date that CONUS or OCONUS per diem rates is valid.  When a pilot or flight attendant uses EZPerDiem.com Per Diem Calculator ^TM, the effective date, the expiration date, the seasonal start date, and the seasonal end date are all checked against the date of each layover that gets entered.

The per diem rate tables are not always standardized, so EZPerDiem.com uses a complicated algorithm designed to extract that data straight from the government provided per diem tables.

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