"morgens" is round about the time you get up (assuming you get up at some point between, say, 5 and 8 or 9 at the latest).
"vormittags" is more or less the time between getting up and 12 o'clock noon (mittags).
March 22, 2017
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"Morgen" lasts until about 10 o'clock and then "Vormitag" lasts until about 12 o'clock. However, you say "Guten Morgen!" - from midnight until 12 o'clock, because there's no "Guten Vormittag!".
March 29, 2017
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March 22, 2017
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