Add the "subsecond" modifier to the date/time functions.

FossilOrigin-Name: 6fcb5a941fba0449d017954590bde7da74e5a1f8fd9b3e1febdff9bed1f22051

diff --cc manifest
index 0e1b742f45c66a96941d21eae333a39d3a4ebbbd,c239180afb38dcc4f9ae7cbb27970f75e66a979f..21ebfe0326e02843e473780e54b94beee23a6278
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Enhance\sthe\sformat()\sfunction\sso\sthat\sthe\s","\smodifier\sworks\sfor\sfloating\npoint\snumbers\sin\saddition\sto\sintegers.
- D 2023-05-04T14:44:53.844
 -C Add\ssome\stests\sof\ssubsecond\smodifier\sfor\sdate/time\sfunctions.\sSync\swith\strunk.
 -D 2023-05-04T20:19:33.316
++C Add\sthe\s"subsecond"\smodifier\sto\sthe\sdate/time\sfunctions.
++D 2023-05-04T20:28:19.528
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  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
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  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index 7846920bc77a7ae4ab1a42cd7f95f6eb2efb923f,9505d9cefbefe7c172f6d2ebefab4e5113f68e07..54e7dbe99328dfb9a6550ab058ac3e6d9c3f4570
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
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 -6499ebff545e663198bd0534be205a4e9ca68c7fb20fdcfa54fae4d9b79bfe3a
++6fcb5a941fba0449d017954590bde7da74e5a1f8fd9b3e1febdff9bed1f22051