Extended tstamp task.

[siad007]

Added test and the feature to define a fixed date.

[codecov]

Codecov Report

Merging #995 into master will increase coverage by 0.15%.
The diff coverage is 76%.

@@             Coverage Diff              @@
##             master     #995      +/-   ##
============================================
+ Coverage     45.04%   45.19%   +0.15%     
- Complexity     9939     9946       +7     
============================================
  Files           500      500              
  Lines         24077    24094      +17     
============================================
+ Hits          10845    10890      +45     
+ Misses        13232    13204      -28

Impacted Files	Coverage Δ	Complexity Δ
classes/phing/tasks/system/TstampCustomFormat.php	57.69% <50%> (+57.69%)	11 <7> (ø)	⬇️
classes/phing/tasks/system/TstampTask.php	88.23% <80.95%> (+88.23%)	13 <7> (+7)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4732b93...ef3f0fd. Read the comment docs.