Opened 9 years ago

Closed 9 years ago

Last modified 8 years ago

#22 closed task (fixed)

change pulse_time to DataAndTime type

Reported by: zhangjr Owned by: tangm
Priority: major Milestone:
Component: component1 Version:
Keywords: Cc:
Blocked By: Blocking:
Parent ID: Parent Tickets:
Estimated Number of Hours: 0.0 Add Hours to Ticket: 0
Billable?: yes Total Hours: 0

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Change History (7)

comment:1 Changed 9 years ago by zhangjr

The time is in Unix format in nanosecond, with the epoch of 1970-01-01. The local time in UTC is 1970-01-01 08:00:00+08:00.

see:
​http://www.epochconverter.com/

Version 0, edited 9 years ago by zhangjr (next)

comment:2 Changed 9 years ago by zhangjr

If the precision is nano-second, int64 (~18 decimal digits) is not enough. So the 100 ns is taken finally.

step 1: from UTC (local time +8) to unix timestamp (without timezone)
step 2: from float unix time to integer in 100ns, with bin [-50+i*100, 50+i*100)

As the data is loaded into Mantid, the epoch time has to been converted from 1970.1.1 to 1990.1.1.

comment:3 Changed 9 years ago by zhangjr

  • Owner changed from somebody to tangm
  • Status changed from new to assigned

comment:4 Changed 9 years ago by tangm

  • Status changed from assigned to accepted

comment:5 Changed 9 years ago by tangm

Unix time is not suitable due to leap seconds. TAI and UTC datetime should be used in this case.

APIs for conversion between TAI and UTC are provided in CalendarTool class.

comment:6 Changed 9 years ago by tangm

  • Resolution set to fixed
  • Status changed from accepted to closed
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