SLD99 Sri Lanka Grid 1999 - EPSG:5235

WKT

PROJCS["SLD99_Sri_Lanka_Grid_1999", 
	GEOGCS["GCS_SLD99", 
		DATUM["D_Sri_Lanka_Datum_1999", 
			SPHEROID["Everest_Adjustment_1937", 6377276.345, 300.8017]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 500000.0], 
	PARAMETER["False_Northing", 500000.0], 
	PARAMETER["Central_Meridian", 80.77171308333334], 
	PARAMETER["Scale_Factor", 0.9999238418], 
	PARAMETER["Latitude_Of_Origin", 7.000471527777778], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["SLD99_Sri_Lanka_Grid_1999", 
	BASEGEOGCRS["GCS_SLD99", 
		DATUM["D_Sri_Lanka_Datum_1999", 
			ELLIPSOID["Everest_Adjustment_1937", 6377276.345, 300.8017]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", 500000.0], 
		PARAMETER["False_Northing", 500000.0], 
		PARAMETER["Central_Meridian", 80.77171308333334], 
		PARAMETER["Scale_Factor", 0.9999238418], 
		PARAMETER["Latitude_Of_Origin", 7.000471527777778]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "5235"]]

Data from @esri/proj-codes

{
  "wkid": 5235,
  "latestWkid": 5235,
  "gcsWkid": 5233,
  "macro": "PE_PCS_SLD99_SRI_LANKA_GRID_1999",
  "name": "SLD99_Sri_Lanka_Grid_1999",
  "wkt": "PROJCS[\"SLD99_Sri_Lanka_Grid_1999\",GEOGCS[\"GCS_SLD99\",DATUM[\"D_Sri_Lanka_Datum_1999\",SPHEROID[\"Everest_Adjustment_1937\",6377276.345,300.8017]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",500000.0],PARAMETER[\"False_Northing\",500000.0],PARAMETER[\"Central_Meridian\",80.77171308333334],PARAMETER[\"Scale_Factor\",0.9999238418],PARAMETER[\"Latitude_Of_Origin\",7.000471527777778],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"SLD99_Sri_Lanka_Grid_1999\",BASEGEOGCRS[\"GCS_SLD99\",DATUM[\"D_Sri_Lanka_Datum_1999\",ELLIPSOID[\"Everest_Adjustment_1937\",6377276.345,300.8017]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",500000.0],PARAMETER[\"False_Northing\",500000.0],PARAMETER[\"Central_Meridian\",80.77171308333334],PARAMETER[\"Scale_Factor\",0.9999238418],PARAMETER[\"Latitude_Of_Origin\",7.000471527777778]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"5235\"]]",
  "description": "SLD99 Sri Lanka Grid 1999",
  "authority": "EPSG",
  "version": "7.5.9(10.1.0)",
  "deprecated": "no",
  "areaname": "Sri Lanka - onshore",
  "extent": {
    "slat": 5.86,
    "nlat": 9.88,
    "llon": 79.64,
    "rlon": 81.95
  }
}