Allow setting start end with relative time

[kezhenxu94]

@wankai123 can you please verify?

[codecov-commenter]

Codecov Report

Merging #128 (9350b6a) into master (48338d3) will decrease coverage by 0.52%.
The diff coverage is 15.78%.

❗ Current head 9350b6a differs from pull request most recent head 6503ed8. Consider uploading reports for the commit 6503ed8 to get more accurate results

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
- Coverage   28.00%   27.47%   -0.53%     
==========================================
  Files          20       20              
  Lines         400      404       +4     
==========================================
- Hits          112      111       -1     
- Misses        280      286       +6     
+ Partials        8        7       -1     

Impacted Files	Coverage Δ
internal/commands/interceptor/duration.go	43.85% <15.78%> (-5.20%)	⬇️

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[wankai123]

verified