# How to convert local time to gmt/utc?

Hi,
I’m trying to convert local to gmt by using the timezone offset but it appears math operations do not with the timezone offset.

([HOUR_0_23]+([TMZN_OFS_WITH_DST]*-1)

Any idea how I can convert?

Try this. Code is huge, ugly but works. I’m not sure about how often these tag expressions are refreshed

``````((-1)*([HOUR_0_23]+(((((((((((((((((((((((((([TMZN_OFS_WITH_DST]=="-12"?(-12):0)+([TMZN_OFS_WITH_DST]=="-11"?(-11):0))+([TMZN_OFS_WITH_DST]=="-10"?(-10):0))+([TMZN_OFS_WITH_DST]=="-9"?(-9):0))+([TMZN_OFS_WITH_DST]=="-8"?(-8):0))+([TMZN_OFS_WITH_DST]=="-7"?(-7):0))+([TMZN_OFS_WITH_DST]=="-6"?(-6):0))+([TMZN_OFS_WITH_DST]=="-5"?(-5):0))+([TMZN_OFS_WITH_DST]=="-4"?(-4):0))+([TMZN_OFS_WITH_DST]=="-3"?(-3):0))+([TMZN_OFS_WITH_DST]=="-2"?(-2):0))+([TMZN_OFS_WITH_DST]=="-1"?(-1):0))+([TMZN_OFS_WITH_DST]=="0"?0:0))+([TMZN_OFS_WITH_DST]=="12"?(12):0))+([TMZN_OFS_WITH_DST]=="11"?(11):0))+([TMZN_OFS_WITH_DST]=="10"?(10):0))+([TMZN_OFS_WITH_DST]=="9"?(9):0))+([TMZN_OFS_WITH_DST]=="8"?(8):0))+([TMZN_OFS_WITH_DST]=="7"?(7):0))+([TMZN_OFS_WITH_DST]=="6"?(6):0))+([TMZN_OFS_WITH_DST]=="5"?(5):0))+([TMZN_OFS_WITH_DST]=="4"?(4):0))+([TMZN_OFS_WITH_DST]=="3"?(3):0))+([TMZN_OFS_WITH_DST]=="2"?(2):0))+([TMZN_OFS_WITH_DST]=="1"?(1):0)))))
``````

Thanks for providing that but that seems a bit overkill.

It would be nice if there was some way for developers to create custom tag expressions with a little bit of java or kotlin coding.

Is there some way to request such features?

Hi,

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Its your only choice for now. Problem is, [TMZN_OFS_WITH_DST] is string type variable. You can wait for another WFS update but there’s no ETA. I believe this was requested / asked about few weeks ago.

Depends on how often these tag expressions are calculated. If they are calculated every time variable within them changes then I think this wouldnt cause any lag / battery drain problems.