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h1. Known time description

h2. Double Time ranges : date from 01/01/1970 to 01/01/2100

• seconds from 01/01/1970 00:00:00 : 0 to 4 102 488 000
• milliseconds from 01/01/1970 00:00:00 : 0 to 4 102 488 000 000 (ambiguity for the first 48days of 1970 with previous time format)
• seconds from 01/01/0000 00:00:00 : 62 168 472 000 to 66 270 960 000 (no ambiguity)
• milliseconds from 01/01/0000 00:00:00 : 62 168 472 000 000 to 66 270 960 000 000 (no ambiguity)
• seconds from 01/01/2000 00:00:00 : - 946 728 000 to 3 155 760 000 ( ambiguity with first time format for time before 2000)
• milliseconds from 01/01/2000 00:00:00 : - 946 728 000 000 to 3 155 760 000 000 (ambiguity for both time from 1970 and 2000)

h2. Known time description

|.Mission Name |.time var name |. units |.DEPEND |.LABLAXIS|.FIELDNAM |.CATDESC |.Type|.VIRTUAL|.nb of records|.VAR_NOTES|
|Cluster FGM |time_tagsCDFNAME |ms |0 |UT |Universal Time|Interval centred time tag |CDF_EPOCH||normal|field missing|
|Cluster HIA |time_tags_CDFNAME |ms |0 |UT |Center Time |Interval centred time tag |CDF_EPOCH||normal|field missing|
|Themis Efi |VARNAME_time |sec |TIME |UT |Same as time var name|UTC, in seconds sinc 01-Jan-1970 00:00:00|CDF_DOUBLE||normal|Unleaped seconds|
|Themis Efi |VARNAME_epoch |field missing|0 |UT |Same as time var name|Unrelated |CDF_EPOCH|true|0|field missing|
|Themis Efi |VARNAME_dot0_epoch|msec|EPOCH0 |UT |Same as time var name|EPOCH of THEMIS time base |CDF_EPOCH|true|0|EPOCH of 01-Jan-1970 00:00:00|