GPS应用和数据处理中，会涉及到许多不同的时间表示法，如GPS系统内部所采用的GPS时标示法，GPS测量应用中常常采用年积日标示法，在科学领域采用儒略日标示法，日常生活中采用历法标示法等，不同的时间标示有不同的目的，它们之间是可以严格的进行互相转换的，-GPS data processing applications and will involve a lot of different time expressions, such as the GPS system when used in the GPS mark law, GPS measurements are often used applications on an annual mark law, adopted in the field of science is indicated by Julian Day , daily life, such as is indicated by the use of the calendar, marked at different times have different purposes, and they can be carried out strictly mutual conversion,