Format Descriptions |
| American Date Format |
This is the standard American date format "MM/DD/YYYY hh:mm:ss" where:
| MM | The numerical month |
| DD | The day of the month |
| YYYY | The year |
| hh | The hour |
| mm | The minute |
| ss | The second |
|
| GMT String |
The date is represented in the string "YYYYDDDhhmmsscccc000" where:
| YYYY | The year |
| DDD | The day of the year |
| hh | The hour |
| mm | The minute |
| ss | The second |
| cccc | The fractional second in tenths of a millsecond |
| 000 | Padding out to 20 characters |
|
| Julian Day |
The standard Julian day. |
| Reduced Julian Day |
The standard Reduced Julian day: JD - 2400000 |
| WMAP Reduced Julian Day |
WMAP telemetry times are given to the tenth of a millisecond (tms). During
early software development, timing errors were discovered that implied that the
standard Reduced Julian Day format didn't have enough precision to keep
consistent time at tms level. To gain enough precision, the MAP team
implemented its own definition of Reduced Julian Day: JD - 2450000 |
| WMAP TOD Timestamp |
Time in the WMAP Time-Ordered Data (TOD) archive are stored on disk in a six byte
format as Mission Elapsed Time (time since the MAP launch; '20011810000000000000' is used).
The first two bytes are the integer days since the reference date while the last
four bytes are the fractional day measured as an integer in tenths of a
millisecond. |
