Datetimetype cannot be resolved

I have some rules in which i update items with a timestamp.
And they actually work, but in openhab 2 they throw errors in logs so I want them fixed now as they could potentially be broken later down the road.

Item:

Contact	AR50ReedSwitch	"AR50ReedSwitch [%s]"	<lock>	{ mqtt=">[brokerXXX:state:CLOSED:0], >[brokerXXX:state:OPEN:1], <[brokerXXX:state:MAP(lock.map)" }
Contact	AR51ReedSwitch	"AR51ReedSwitch [%s]"	<lock>	{ mqtt=">[brokerXXX:state:CLOSED:0], >[brokerXXX:state:OPEN:1], <[brokerXXX:state:MAP(lock.map)" }
DateTime	AR5x_LastUpdate	" Reedswitch uppdaterad [%1$ta %1$tR]"	<clock>
Number	AR52BatteryVolt	"AR52BatteryVolt [%s V]"	<energy>	{ mqtt="<[brokerXXX:state:default], >[brokerXXX:state:*:${state}]" }
Number	AR53BatteryPercentage	"AR53BatteryPercentage [%s %%]"	<energy>	{ mqtt="<[brokerXXX:state:default], >[brokerXXX:state:*:${state}]" }
String	AR5xBattery_komplett	"Batterylevel [%s]"	<energy>

Rule:

rule "AR5x when device was last seen and double string"
when
  Item AR50ReedSwitch received update or
  Item AR51ReedSwitch received update or
  Item AR52BatteryVolt received update or
  Item AR53BatteryPercentage received update
then
  postUpdate(AR5x_LastUpdate, new DateTimeType())
AR5xBattery_komplett.postUpdate("" + String::format("%s %%", (AR52BatteryVolt.state as DecimalType).floatValue()) + "V / " + String::format("%s %%", (AR53BatteryPercentage.state as DecimalType).floatValue()) + " %")
end

Errors thrown are:
ipt.engine.ScriptExecutionThread] - Rule ‘AR5x when device was last seen and double string’: org.eclipse.smarthome.core.library.types.DecimalType

Other rule that throw errors:

Rule:

rule "Sunrise/Sunset changed"
when
    Item Sunrise_Time changed
    or Item Sunset_Time changed
then
    var DateTime sunrise = new DateTime((Sunrise_Time.state as DateTimeType).calendar.timeInMillis)
    var DateTime sunset = new DateTime((Sunset_Time.state as DateTimeType).calendar.timeInMillis
    Sunrise_Sunset.postUpdate(String::format("%02d:%02d / %02d:%02d", sunrise.getHourOfDay(), sunrise.getMinuteOfHour(), sunset.getHourOfDay(), sunset.getMinuteOfHour()))
end

and item:

DateTime Sunrise_Time "Sunrise [%1$tH:%1$tM]"	{channel="astro:sun:local:rise#start" }
DateTime Sunset_Time "Sunset [%1$tH:%1$tM]"	{channel="astro:sun:local:set#start" }
String	Sunrise_Sunset	"Sunrise / Sunset [%s]"	<sun>

Error:
[el.core.internal.ModelRepositoryImpl] - Configuration model ‘sunrise_sunset.rules’ has errors, therefore ignoring it: [8,5]: missing ‘)’ at ‘Sunrise_Sunset’

I tried looking in eclipse designer but i really do not have a clue what I’m doing.
Used ctrl+space and saw that datetimetype is not valid (?). But what should it be substituted for in that case?
I’m confused to say the least and hope someone could help me.

Closing bracket ?

@rossko57, When you are too close to the trees, you don’t see the forest.
Thank you for solving the sunrise/sunset rule!