CFR > Title 41 - Public Contracts and Property Management > SUBTITLE F—Federal Travel Regulation System > CHAPTER 301—TEMPORARY DUTY (TDY) TRAVEL ALLOWANCES (parts 301-1 to 301-76) > SUBCHAPTER B—ALLOWABLE TRAVEL EXPENSES (parts 301-10 to 301-31) > PART 301-11—PER DIEM EXPENSES > SUBPART A—General Rules (§301-11.1 to §301-11.32) > 301-11.19—How is my per diem calculated when I travel across the international dateline (IDL)?

301-11.19—How is my per diem calculated when I travel across the international dateline (IDL)?

When you cross the IDL your actual elapsed travel time will be used to compute your per diem entitlement rather than calendar days.