3M | Quarter A subdivision of a year into four equal parts. |
6M | Half-year A subdivision of a year into two equal parts. |
AA | Air hour Flight duration irrespective of time zones. |
AD | Air day Flight duration irrespective of time zones. |
CD | Calendar day (includes weekends and holidays) Period given as a number of days including weekends and holidays. |
CW | Calendar week (7day) Period given as a number of 7day-weeks including holidays. |
D | Day The twenty-four hour period during which the earth completes one rotation on its axis. |
DC | Ten days period Period of 10 days. |
DW | Work day |
F | Period of two weeks A period of time lasting fourteen days. Synonym: Fortnight. |
H | Hour One of the twenty-four sub-divisions of a day. |
HM | Half month A subdivision of a month into two equal parts. |
M | Month One of twelve divisions of the year as determined by the Gregorian calendar. |
MN | Minute A unit of time equal to 1/60 of an hour, or 60 seconds. |
P | Four month period A period of time, measured in monthly increments, consisting of four sequential months. |
S | Second A unit of time equal to 1/60 of a minute. |
SD | Surface day The voyage duration irrespective of time zones. |
SI | Indefinite An indefinite period. |
W | Week Period of seven days. |
WD | Workday Day on which work is usually done. |
WW | 5 day work week Monday through Friday. |
Y | Year The period of time as measured by the Gregorian calendar in which the earth completes a single revolution around the sun. |
ZZZ | Mutually defined Period as per agreement. |