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UTC to GPS

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# 1  
Old 11-28-2017
UTC to GPS
Gents,

Kindly can u help with this.

I would like to get GPS time from UTC

Input
Code:
17/11/27 03:13:50:480000
17/11/27 03:12:54:380000
17/11/27 03:14:39:980000

output desired.

Code:
17/11/27 03:13:50:480000 1195787648480000
17/11/27 03:12:54:380000 1195787592380000
17/11/27 03:14:39:980000 1195787697980000

Appreciate your support.

Smilie
# 2  
Old 11-28-2017
Any attempts / ideas / thoughts from your side? Do you have the conversion algorithms at hand?
This User Gave Thanks to RudiC For This Post:
jiam912
# 3  
Old 11-28-2017
RudiC
I got it as Unix Time
Code:
date +%s -ud "17/11/27 03:13:50"

but i dont know how to convert as desired
# 4  
Old 11-28-2017
Quote:
While most clocks derive their time from Coordinated Universal Time (UTC), the atomic clocks on the satellites are set to GPS time (GPST; see the page of United States Naval Observatory). The difference is that GPS time is not corrected to match the rotation of the Earth, so it does not contain leap seconds or other corrections that are periodically added to UTC. GPS time was set to match UTC in 1980, but has since diverged. The lack of corrections means that GPS time remains at a constant offset with International Atomic Time (TAI) (TAI – GPS = 19 seconds). Periodic corrections are performed to the on-board clocks to keep them synchronized with ground clocks.
Basically there is a nineteen second difference. And every time a leap second is applied to UTC you have to increment that number: currently 19 seconds, so 19 -> 20.

UTC to GPS Time Correction - Knowledge Base English - QPS Confluence
These 3 Users Gave Thanks to jim mcnamara For This Post:
drl jiam912 Scott
# 5  
Old 11-28-2017
Now this is becoming somewhat ridiculous, as on 14. Feb. 17 you yourself raised this question. What did people in here post their answers for?
These 3 Users Gave Thanks to RudiC For This Post:
jiam912 rbatte1 Scott
# 6  
Old 11-29-2017
RudiC,

yes u are right about the previous question ( 14 feb ).

As u can see at that time I have the GPStime and the issue was to change the UTC time -3hrs.

The actual case is complete different as i need to get the GPStime from UTC.

Hope u understand

I am trying my self the possibility to solve it.

Appreciate your help

---------- Post updated 11-29-17 at 08:59 AM ---------- Previous update was 11-28-17 at 09:49 AM ----------

RudiC

I get the output desired using this code
Code:
ts=$(date -d'01/06/1980 00:00:00' +%s)

lap=18

cat file |
	while read tt 
	do 
	dt=`echo $tt | awk '{print $1}' | awk -F"/" '{print $2"/"$3"/"$1}'`
	tm=`echo $tt | awk '{print substr($2,1,8)}'`
	ms=`echo $tt | awk '{print $2}' | awk -F":" '{print $NF}'`
	line=`echo $dt" " $tm`
	echo $line\ $(date -d "${line/// }" "+%s") | 
	awk '{print (($3 - '$ts') + '$lap')'$ms'}' 
	done


output

Code:
1195787648480000
1195787592380000
1195787697980000

Can u check if you can help me to do it in short code, please Smilie
# 7  
Old 11-30-2017
Gents,

Kindly, can you help to improve this code to be faster .. with 50000 lines in my file this take a lot time.

I appreciate your help.
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