CRBasic Example 38. NSEC —Convert Timestamp to Universal Time
'This program example demonstrates the use of NSEC data type to convert a data time stamp
'to universal time.
'
'Application: the CR1000 needs to display Universal Time (UT) in human readable
'string forms. The CR1000 can calculate UT by adding the appropriate offset to a
'standard time stamp. Adding offsets requires the time stamp be converted to numeric
'form, the offset applied, then the new time be converted back to string forms.
'These are accomplished by:
' 1) reading Public.TimeStamp into a LONG numeric variable.
' 2) store it into a type NSEC datum in final-data memory.
' 3) sample it back into string form using the TableName.FieldName notation.
'Declarations
Public UTTime(3) As String * 30
Dim TimeLong As Long
Const UTC_Offset = -7 * 3600 '-7 hours offset (as seconds)
DataTable(TimeTable,true,1)
Sample(1,TimeLong,Nsec)
EndTable
'Program
BeginProg
Scan(1,Sec,0,0)
'1) Read Public.TimeStamp into a LONG numeric variable. Note that TimeStamp is a
' system variable, so it is not declared.
TimeLong = Public.TimeStamp(1,1) + UTC_Offset
'2) Store it into a type NSEC datum in final-data memory.
CallTable(TimeTable)
'3) sample time to three string forms using the TableName.FieldName notation.
'Form 1: "mm/dd/yyyy hr:mm:ss
UTTime(1) = TimeTable.TimeLong(1,1)
'Form 2: "dd/mm/yyyy hr:mm:ss
UTTime(2) = TimeTable.TimeLong(3,1)
'Form 3: "ccyy-mm-dd hr:mm:ss (ISO 8601 Int'l Date)
UTTime(3) = TimeTable.TimeLong(4,1)
NextScan
7.9.11 Data Output: Writing High-Frequency Data to Memory
Cards
Related Topics:
• Memory Card (CRD: Drive) — Overview (p. 89)
• Memory Card (CRD: Drive) — Details (p. 376)
• Memory Cards and Record Numbers (p. 466)
• Data Output: Writing High-Frequency Data to Memory Cards (p. 205)
• File-System Errors (p. 389)
• Data Storage Devices — List (p. 653)
205
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